This collection presents a comprehensive overview of James K. Lewis’s studies and projects conducted at various field stations, including Cottonwood Range and Antelope Range field stations, as well as the Badlands of South Dakota. The primary focus is on range management, forage production, and utilization and cover a broad spectrum of topics, including cattle weights, clip plot data analysis, soil moisture samples, and utilization studies, reflecting extensive data collection over several years. The collection also highlights interactions with prominent organizations like the American Grassland Council and the American Society of Range Management, indicating collaborative efforts and regional projects. The material covers a diverse range of studies, projects, and course materials related to range management. These include aerial photographs, ecological grassland studies, tool calibration, and extensive field data collection. The breadth of topics covered underscores a holistic approach to understanding and preserving ecosystems within these regions.