Darton, Nelson Horatio,  1865-1948. <br/><br/>
Configuration of the bedrock surface of the District of Columbia and vicinity. 
This report embodies subsurface data of interest to engineers and builders compiled from 1890 to 1940. 
 - Washington :  U.S. Govt. Print. Off.,  1950. 
 - 42 p. :  ill., maps (part col., 4 in pocket) ;  29 cm. 
<br/><br/><label>LCCN: </label>gs 52000105  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petrology--Washington (D.C.)<br/>Physical geography--Washington (D.C.)<br/>Borings--Washington (D.C.)
<br/><br/><label>LC Class. No.: </label>QE75  / .P9 no. 217 
<br/><br/><label>Dewey Class. No.: </label>552 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:217