Stewart, John Harris,  1928- <br/><br/>
Upper Proterozoic and Cambrian rocks in the Caborca region, Sonora, Mexico :  physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations / 
by John H. Stewart, Mark A.S. McMenamin, and Juan Manuel Morales-Ramirez 
 - Washington, D.C :  United States Government Printing Office, U.S. Geological Survey,  1984 
 - iii, 36 p. :  ill ;  29  cm. 
 - U.S. Geological Survey professional paper ;  1309 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Precambrian<br/>Geology, Stratigraphic--Cambrian<br/>Geology--survey--Mexico--Heroica Caborca
<br/><br/><label>Dewey Class. No.: </label>551.715097217