Wingard, G. Lynn. <br/><br/>
A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States  an example of the nature of extinction at the boundary 
by G. Lynn Wingard. 
 - Washington  Denver, CO  U.S. G.P.O.  For sale by U.S. Geological Survey, Map Distribution  1993. 
 - vi, 131 p., [46] p. of plates  ill., maps  29 cm. 
 - U.S. Geological Survey professional paper  1535 .
<br/><br/> Spine title: Cretaceous and Tertiary Crassatellidae, eastern United States. 
<br/><br/>Includes bibliographical references (p. 96-104). 
<br/><br/><label>LCCN: </label>92043207  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crassatellidae--United States.<br/>Paleontology--United States.<br/>Cretaceous/Tertiary boundary.<br/>Paleontology--Tertiary.<br/>Paleontology--Cretaceous.
<br/><br/><label>LC Class. No.: </label>QE812.V45  / W56 1993 
<br/><br/><label>Dewey Class. No.: </label>564/.11 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:1535