Correspondence between Spreiregen and Hans Blumenfeld, concerning publication of Blumenfeld's writings by MIT Press; drafts of articles written by Spreiregen for the American Institute of Architects, concerning architecture and city and regional planning; and material concerning regional planning in Finland.

Collection contains files documenting Ross's time as an architect, his environmental work in which he helped establish the Jackson Bog State Nature Preserve in Ohio, and his work in beekeeping where he patented the "Ross Rounds" system of creating honey comb. Also includes slides, maps, photographs, ephemera, a collection of business cards of regional beekeepers, correspondence, and a letter from Buckminster Fuller to Tom Ross.