Reports upon the specimens obtained from borings made in 1874 between the Mississippi
River and Lake Borgne, at the site proposed for an outlet for flood waters / by Prof.
Eugene W. Hilgard and Dr. F.V. Hopkins ; with a letter of transmittal from bvt. maj.
general G. K. Warren,... being a supplement to the report of the commission of engineers
of January 16, 1875 ; Engineer Department, U. S. Army ; Reclamation of the alluvial
basin of the Mississippi river, 1878