The L.M. Winsor collection consists of personal and job-related photographs and published and unpublished essays from his work as Irrigation Engineer. Most of the essays are typed reports to government agencies. The first three boxes of the collection house these reports with the reports on his work in Iran located in Box 15.

The photographs in this collection are mounted on sheets of paper with hand written captions accompanying most of them, and are grouped into related topics as outlined in the register. The photographs themselves can be separated into two types: personal and job-related. Box 4 Folders 1-6 contains the personal photographs, while the remainder of the collection consists of job-related pictures.

There is also a separate L.M. Winsor photographic collection (P0343) which houses about 800 negatives and prints.