"Age of Mammals," 2nd ed., corrections, Index of 2nd ed., 1930

Series 2 (Boxes 6 to 21) contains materials related to Osborn’s published papers, articles, and unpublished manuscripts, including substantial works like “Age of Mammals” and his Titanotheres monograph, as well as other writings on horses, Proboscidea, evolution, fauna, flora, vertebrate paleontology, and other subjects. Materials include notes, addresses given or written by Osborn, revisions, correspondence, illustrations, photographs, notebooks, and more. It is arranged alphabetically, then chronologically.