Imlay, Ralph W.  1908-1989. <br/><br/>
Twin Creek limestone (Jurassic) in the western interior of the United States, 
by Ralph W. Imlay. 
 - Washington,  U.S. Govt. Print. Off.,  1967. 
 - iv, 105 p.  illus., maps, 16 plates.  29 cm. 
 - Geological Survey professional paper 540 .
 - Geological Survey (U.S.).  Professional paper ;  540. .
<br/><br/>Bibliography: p. 99-102. 
<br/><br/><label>LCCN: </label>gs 66000297  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--West (U.S.)<br/>Geology, Stratigraphic--Jurassic.<br/>Paleontology--West (U.S.)
<br/><br/><label>LC Class. No.: </label>QE75  / .P9 no. 540 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:540