Multi-volume work

Osborn, H.F. 1936-1942. Proboscidea: A Monograph of the Discovery, Evolution, Migration and Extinction of the Mastodonts and Elephants of the World. The American Museum Press, New York.

Volumes

1. Osborn, H.F., 1936. Volume I: Mœritherioidea, Deinotherioidea, Mastodontoidea, 15 Aug 1936: [i]-xl, 1-802.
2. Osborn, H.F., 1942. Volume II: Stegodontoidea, Elephantoidea: [i]-xxvii, 805-1675, errata.