Nilsen, Tor Helge. <br/><br/>
Stratigraphy of the Cretaceous Hornbrook Formation, southern Oregon and northern California 
by Tor H. Nilsen. 
 - Washington  Denver, CO  U.S. G.P.O.  For sale by Book and Open-File Report Sales, U.S. Geological Survey  1993. 
 - iv, 89 p.  ill., maps (some col.)  28 cm. 
 - U.S. Geological Survey professional paper  1521 .
<br/><br/> One map on folded leaf in pocket. 
<br/><br/>Includes bibliographical references (p. 77-82). 
<br/><br/><label>LCCN: </label>93003585  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Cretaceous.<br/>Geology--Oregon.<br/>Geology--California.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Hornbrook Formation Calif. and Or.
<br/><br/><label>LC Class. No.: </label>QE685  / .N55 1993 
<br/><br/><label>Dewey Class. No.: </label>551.7/7/097952 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:1521