Origin, extent, and thickness of Quaternary geologic units in the Willamette Valley, Oregon / 
by Jim E. O'Connor ... [et al.] ; prepared in cooperation with Oregon Water Resources Department. 
 - Reston, Va. :  Denver, CO :  U.S. Dept. of the Interior, U.S. Geological Survey ;  For sale by the U.S. Geological Survey, Information Services,  2001. 
 - iv, 52 p. :  ill. (some col.), col. maps ;  28 cm. 
 - U.S. Geological Survey professional paper ;  1620 .
<br/><br/> One folded col. map in pocket. 
<br/><br/>Includes bibliographical references (p. 37-40). 
<br/><br/><label>ISBN: </label>0607948329 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Quaternary.<br/>Geology--Oregon--Willamette River Valley.