Hilgard, Eugene W.  1833-1916. <br/><br/>
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. 
<br/><br/><label>LCCN: </label>gs 07000830  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Mississippi River.
<br/><br/><label>LC Class. No.: </label>QE117  / .H57