Marshall, R. B.  1867-1949. <br/><br/>
Results of spirit leveling in Delaware, District of Columbia, Maryland, and Virginia, 1896 to 1909, inclusive. 
R.B. Marshall, Chief geographer. Work done in cooperation with the state of Maryland during the entire period and with the state of Virginia in part of 1908. 
 - Washington,  Govt. Print. Off.,  1910. 
 - 74 p.  24 cm. 
 - U.S. Geological survey. Bulletin  no. 434 .
 - United States.  Geological Survey.  Bulletin ;  434. .
<br/><br/> Issued also as House doc. no. 1015, 61st Cong., 3d sess.  Includes index. 
<br/><br/><label>LCCN: </label>gs 10000499  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Delaware--Altitudes.<br/>Washington (D.C.)--Altitudes.<br/>Maryland--Altitudes.<br/>Virginia--Altitudes.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 434