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The Correspondence series (5.4 linear feet) is divided into two groups. The first is organized chronologically with folders on specific subjects interfiled. Some correspondence may also be found throughout the collection in folders labeled "papers" on a particular subject. An index of select correspondents in this group is available in the Additional Descriptive Data section.

The second group, received in the 2016 accession, is organized alphabetically by surname, as it was maintained by Hobbs. Hobbs corresponded with many notable polar and other explorers, University of Michigan presidents, United States government officials and military leaders, journalists, scientists, publishers, professors, and other individuals. Topics in this grouping include World War I and II, military preparedness and training at the University of Michigan, Hobbs' involvement with the National Security League, early polar expeditions, and reviews and opinions on Hobbs' scientific publications and other writings such as his biography of explorer Richard Peary.

Personal Materials (0.4 linear feet, 6 scrapbooks) documents Hobbs' interests and life. This series contains his autobiography, poetry he wrote, as well as passports and travel documents. Materials in the 2016 accession include six biographical scrapbooks containing photographs of Hobbs' family lineage, correspondence, clippings, documents, and ephemera. Also of note is a portrait drawing of Hobbs with sled dogs.

The Visual Materials series (1.5 linear feet) contains both personal and professional images. Two folders hold photographs from an expedition to the Marshall Islands. Another folder contains captioned photos used in a book written by Hobbs. Visual materials in the 2016 accession are organized alphabetically by photographer/studio name, individual surname, or description. Images primarily include autographed portraits, photo reproductions, images of expeditions to Greenland, other travels, a small number of lithographs, and two watercolors painted by Hobbs.