Walcott, Charles D.  1850-1927. <br/><br/>
Correlation papers ; Cambrian / 
by Charles Doolittle Walcott. 
 - Washington,  Govt. Print. Off.,  1891. 
 - 447 p. :  iii fold. maps, diagrs. ;  24 cm. 
 - U.S. Geological survey. Bulletin  no. 81 .
 - United States.  Geological Survey.  Bulletin ;  81. .
<br/><br/> Literature : p. 19-48. 
<br/><br/><label>LCCN: </label>gs 05000660  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Cambrian.<br/>Geology--United States.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 81