Irwin, J. H. <br/><br/>
Geology of the Paleozoic rocks, Navajo and Hopi Indian reservations, Arizona, New Mexico, and Utah / 
by J. H. Irwin, P. R. Stevens and M. E. Cooley. 
 -- Washington :   United States Government Printing Office,   1971 
 - 32 p. + map. -- 
 (Geological Survey Professional Paper  ;  521-C).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arizona<br/>Nuevo Mexico<br/>Paleozoico<br/>Rocas<br/>Utah
<br/><br/><label>Universal Decimal Class. No.: </label>552(789+791/792)"613"