Apple photographed with a ruler for scale for N.E. Hansen's research

Apple photographed with a ruler for scale for N.E. Hansen's research

Apple sliced in half and photographed with a ruler for scale for N.E. Hansen's research

Three assistants to N.E. Hansen are gathering specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

Assistants to N.E. Hansen gather specimens of pears in Saolin in northern China; written in pencil on the back: Saolin 1924 North China pear research

Assistants to N.E. Hansen gather specimens of pears in Saolin in northern China; written in pencil on the back: Saolin 1924 North China pear research

Fruit peddlers at Anda in northern China, a man is walking across the tracks of the Trans-Siberian Railway, there are soybeans temporarily stored in covered bins awaiting shipment in the background; written in pencil on the back: Soybeans stored ready for shipment at Anda, North China 1924

Fruit peddlers at Anda in northern China, soybeans are temporarily stored in covered bins awaiting shipment in the background; written in pencil on the back: Soybeans stored ready for shipment at Anda, North China 1924

Men selling fruit on the Trans-Siberian Railway in Manchuria, China; written in pencil on the back: Chinese selling fruit on Siberian Railway Manchuria 1924

Fruit tree on the campus of South Dakota State College was part of N.E. Hansen's research on fruit

Fruit tree on the campus of South Dakota State College was part of N.E. Hansen's research on fruit

Man with a carrying pole on his shoulders and a basket full of pears at N.E. Hansen's headquarters while conducting pear research at Saolin in northern China; written in pencil on the back: North China 1924

Man with a carrying pole on his shoulders is with another man and a young child in front of N.E. Hansen's headquarters while conducting pear research at Saolin in northern China; written in pencil on the back: North China 1924

Man with a carrying pole on his shoulders and two baskets full of pears at N.E. Hansen's headquarters while conducting pear research at Saolin in northern China; written in pencil on the back: North China 1924

Man feeding chickens in Saolin in northern China where N.E. Hansen was conducting research on pears; written in pencil on the back: Saolin, Manchuria 1924 North China pear research

Men selling pears by the Trans-Siberian Railway east of Harbin, China while other walk by; written in pencil on the back: Chinese selling pears on East Siberian Railway east of Harbin, 1924

Men selling wild grapes by the Trans-Siberian Railway east of Harbin, China; written in pencil on the back: Selling wild grapes on railway east of Harbin, 1924

Mountain scenery on the Trans-Siberian Railway at Saolin in northern where N.E. Hansen was conducting research on pears

N.E. Hansen and his three assistants gathering specimens in a field with a horse-drawn wagon at Mendoche before they begin a search for hardy peach trees in northern China, there is a dog in the grass; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen and his three assistants stand by a horse-drawn wagon by a building at Mendoche before they begin a search for hardy peach trees in northern China; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen and his three assistants stand by a horse-drawn wagon by a building at Mendoche before they begin a search for hardy peach trees in northern China; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen and his three assistants gathering specimens in a field with a horse-drawn wagon at Mendoche before they begin a search for hardy peach trees in northern China, there is a dog in the grass; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen and his three assistants gathering specimens in a field with a horse-drawn wagon at Mendoche before they begin a search for hardy peach trees in northern China, there is a dog in the grass; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen and two assistants gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924, Hansen is holding a peach tree specimen, one man is holding a gun, burlap bags are holding specimens, there is a dog in the foreground; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants climb rough terrain to gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants climb rough terrain to gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants are gathering specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants climb rough terrain to gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants climb rough terrain to gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924, Hansen is holding a peach tree specimen, one man is holding a gun; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants climb rough terrain to gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants are gathering specimens in their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen and two assistants rest in the grass on their search for hardy peach trees in Mendoche in northern China in 1924; written in pencil on the back: Mendoche, North China 1924

Man smiles for the camera while N.E. Hansen is looking the fruit he has for sale at a bazaar in Harbin, China; written in pencil on the back: Harbin 1924

N.E. Hansen and another man are sitting in rickshaws while Hansen was on the hunt for pears in northern China, there are several children surrounding them; written in pencil on the back: 1924 Hunting for Pears Niels Hansen north China

N.E. Hansen standing by a fruit tree on the campus of South Dakota State College that was part of Hansen's research on fruit

N.E. Hansen standing by a fruit tree on the campus of South Dakota State College that was part of Hansen's research on fruit

N.E. Hansen looking at a fruit tree on the campus of South Dakota State College that was part of Hansen's research on fruit

N.E. Hansen looking at a fruit tree on the campus of South Dakota State College that was part of Hansen's research on fruit

N.E. Hansen is standing behind a man with a carrying pole on his shoulders and two baskets full of pears at Hansen's headquarters while conducting pear research at Saolin in northern China, there are two men accompanying them, another man stands off to the left; written in pencil on the back: North China 1924

N.E. Hansen is standing behind a man with a carrying pole on his shoulders and two baskets full of pears at Hansen's headquarters while conducting pear research at Saolin in northern China, there are two men accompanying them; written in pencil on the back: North China 1924

Four of N.E. Hansen's assistants stand by a horse-drawn wagon by a building at Mendoche before they begin a search for hardy peach trees in northern China; written in pencil on the back: Mendoche 1924 North China

N.E. Hansen's assistants gather specimens in their search for hardy peach trees in Mendoche in northern China in 1924, one man is holding a gun; written in pencil on the back: Mendoche, North China 1924

N.E. Hansen's headquarters while conducting pear research at Saolin in northern China; written in pencil on the back: Saolin, China my headquarters for pears in the mountains 1924

N.E. Hansen's mountain headquarters is nestled in the trees while conducting pear research at Saolin in northern China; written in pencil on the back: Saolin, China my headquarters fro pears in the mountains 1924

N.E. Hansen's mountain headquarters is nestled in the trees while conducting pear research at Saolin in northern China; written in pencil on the back: Saolin, China my headquarters fro pears in the mountains 1924

Pear tree in the mountains was photographed as an example during N.E. Hansen's research on pears at Saolin in northern China; written in pencil on the back: Saolin, China my headquarters fro pears in the mountains 1924

Terrain in Mendoche, northern China that N.E. Hansen traveled in is search for hardy peach trees in 1924; written in pencil on the back: Mendoche, North China 1924

Terrain in Mendoche, northern China that N.E. Hansen traveled in is search for hardy peach trees in 1924; written in pencil on the back: Mendoche, North China 1924

Terrain in Mendoche, northern China that N.E. Hansen traveled in is search for hardy peach trees in 1924; written in pencil on the back: Mendoche, North China 1924