At head of title: Engineer Department, U.S. Army. Geographical explorations and surveys west of the one hundredth meridian ... Geo. M. Wheeler ... in charge.
Extract from appendix FF of the Annual report of the chief of engineers, 1874.
The "second and final" part of this report was published under title Systematic catalogue of Vertebrata of the eocene of New Mexico ... April 17, 1875. Full report issued in the quarto series, vol. 4., pt. 2, Washington, 1877.