Vol 1 (1924): An annotated bibliography of the publications relating to the history, biography and bibliography of American natural history and its institutions, during colonial times and the pioneer century, which have been published up to 1924; with a classified subject and geographic index; and a bibliography of biographies. Vol 2 (1926): The institutions which have contributed to the rise and progress of American natural history, which were founded or organized between 1769 and 1844. Vol 3 (1929): The institutions founded or organized between 1845 and 1865. Bibliography of books. Chronological tables. Index of authors and institutions. Addenda to Volume 1.