Sims, P.K. (Paul Kibler), 1918- <br/><br/>
Great Lakes tectonic zone-revisited / 
by P.K. Sims and W.C. Day 
 - Washington :  U.S. Government Printing Office,  1993 
 - 11 p. :  ill. ;  27 cm. 
 - U.S. Geological Survey bulletin ;  1904-S .