[Note 21: All who are especially interested in the life history of the
buffalo, both scientific and economical, will do well to consult Mr.
Allen's monograph, "The American Bisons, Living and Extinct," if it be
accessible. Unfortunately it is a difficult matter for the general
reader to obtain it. A reprint of the work as originally published, but
omitting the map, plates, and such of the subject-matter as relates to
the extinct species, appears in Hayden's "Report of the Geological
Survey of the Territories," for 1875 (pp. 443-587), but the volume has
for several years been out of print.

The memoir as originally published has the following titles:

_Memoirs of the Geological Survey of Kentucky.| N. S. Shaler, Director.|
Vol. I. Part II.|--| The American Bisons,| living and extinct.| By J. A.
Allen.| With twelve plates and map.|--| University press, Cambridge:|
Welch, Bigelow & Co.| 1876._

_Memoirs of the Museum of Comparative Zoology,| at Harvard College,
Cambridge, Mass.| Vol. IV. No. 10.|--| The American Bisons,| living and
extinct.| By J. A. Allen.| Published by permission of N. S. Shaler,
Director of the Kentucky| Geological Survey.| With twelve plates and a
map.| University press, Cambridge:| Welch, Bigelow & Co.| 1876.|_

_4to., pp. i-ix, 1-246, 1 col'd map, 12 pl., 13 ll. explanatory, 2
wood-cuts in text._

These two publications were simultaneous, and only differed in the
titles. Unfortunately both are of greater rarity than the reprint
referred to above.]