00672cam a22002051i 4500 gs 07000830 DLC 20260227111306.0 860430s1870 dcu f000 0 eng c gs 07000830 (OCoLC)13511678 Library, U.S. Geol. Survey MiHM DLC premarc QE117 .H57 Hilgard, Eugene W. (Eugene Woldemar), 1833-1916. Report on the geological age of the Mississippi delta / by Professor E. W. Hilgard to General A. A. Humphreys. Washington : Gov't print. off., 1870. 16 p. ; 23 cm. Geology Mississippi River. 24642 24642