Series I. Research and Manuscripts contains research, articles, and other short manuscripts written by Robinson. The contents in this series have been arranged alphabetically by their original topic or title. The research includes notes, sketches, news clippings, and excerpts from publications. At the end of this series are stamps collected by Robinson, some are loose, others are in what appears to be an unbound scrapbook, which contain items with stamps and postage marks. There is also a scrapbook about Robinson's book Ferns: In Their Homes and Ours.