Marshall, R. B.  1867-1949. <br/><br/>
Results of spirit leveling in Virginia, 1900 to 1913, inclusive / 
R.B. Marshall, chief geographer; part of work since 1907 done in cooperation with the state of Virginia through Virginia Geological Survey, T.L. Watson, state geologist. 
 - Washington,  Govt. Print. Off.,  1914. 
 - 68 p. :  pl. ;  24 cm. 
 - U.S. Geological survey. Bulletin 562 .
 - United States.  Geological Survey.  Bulletin ;  562. .
<br/><br/> Includes index. 
<br/><br/><label>LCCN: </label>gs 14000855  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Virginia--Altitudes.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 562