This collection is composed of reports on experiments conducted at the Big Stone Power Plant, collected material, files related to his consulting work with Dorand Engineering Services, personal material consisting of correspondence, class lectures, research, community involvement, and publications.

This collection is composed of material collected by J.P. Hendrickson in his work with the South Dakota Constitutional Revision Commission and the writing of the Home Rule Charter for Brookings, South Dakota in 1996. Folders contain reports, commission documents, minutes, correspondence, material relating to constitutional amendments, and notes.