Visual materials, 1920-1967 and undated

This series contains slides and photographs taken and/or collected by Wood with a focus on the many different aspects of irrigation. Major topics include application, land preparation, pumping, structures, and transportation. Labeled photos and slides were arranged according to Wood's "Reference material filing key." If unlabeled, they were categorized according to the same key. Labeled items not falling into a category of the key were kept under the label that was present; unlabeled items were filed under miscellaneous.