Pratt, Walden P. <br/><br/>
The midcontinent strategic and critical minerals project :  summary and background information to accompany folio of maps of the northern midcontinent area, latitude 36-46 N. and longitude 88-100 W. / 
by Walden P. Pratt. 
 - Washington, DC :  Denver, CO :  U.S. G.P.O. :  For sale by U.S. Geological Survey, Information Services,  1995. 
 - iii, 19 p. :  ill., maps :  28 cm. 
 - U.S. Geological Survey circular ;  1124 .
<br/><br/> 'Prepared in cooperation with the geological surveys of Arkansas, Illinois, Iowa, Kansas, Kentucky, Minnesota, Missouri, Nebraska, Oklahoma, South Dakota, Tennessee, and Wisconsin.' 
<br/><br/>Includes bibliographical references (p. 18-19). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--Middle West.
<br/><br/><label>LC Class. No.: </label>TN23.4  / .P73 1995