Easton, W. H <br/><br/>
Mississippian fauna in Northwestern sonora Mexico. With nine plates 

 - Washington, D. C :   Smithsonian Institution,   1958. 
 - 87 p. :   ilust. ;   21 cm. 
<br/><br/> Smithsonian miscellaneous collections. Vol. 119, Nš 3. Charles. D. and Mary Vaux Walcott. Research Fund. Publication 4313