This collection consists of correspondence, drawings, drafts and other materials related to various publications by Hannah Thompson Croasdale (1905–1999), Rolf Leo Grönblad (1895–1962), and Arthur Moreland Scott (1888–1963). The materials are primarly created by the latter two, although one folder contains correspondence between Grönblad and Croasdale, and another holds correspondence between Scott and William Randolph Taylor. The non-correspondence materials are primarily arranged by the papers they relate to, and are largely concerning the trio's series of papers on Desmids from given geographical areas.