Simpson, Howard E.  1874-1938. <br/><br/>
Change in ground water levels in North Dakota, 
by Howard E. Simpson; a report based upon data collected for the Mississippi Valley Committee, P. W. A., 1934. 
 - Grand Forks, N. Dak.,  1937. 
 - 23 p. incl. illus. (maps) forms, tables.  23 cm. 
<br/><br/>"References": p. 3. 
<br/><br/><label>LCCN: </label>gs 38000084  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater--North Dakota.
<br/><br/><label>LC Class. No.: </label>QE149  / .A23 no. 10