Marshall, R. B.  1867-1949 <br/><br/>
Results of spirit leveling in Iowa, 1896 to 1913, inclusive / 
R.B. Marshall, chief geographer. Work done in cooperation with the State of Iowa from 1907 to 1913, inclusive. 
 - Washington,  Govt. Print. Off.,  1915. 
 - 126 p.  ill.,  24 cm. 
 - U.S. Geological survey. Bulletin 569 .
 - United States.  Geological Survey.  Bulletin ;  569. .
<br/><br/> Includes index. 
<br/><br/><label>LCCN: </label>gs 15000462  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Iowa--Altitudes.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 569