Emry Robert J. <br/><br/>
Descriptive and comparative osteology of the oldest fossil squirrel, Protosciurus (Rodentia Sciuridae) / 
Robert J. Emry and Richard W.Thorington, Jr. 
 - Washington :  Smithsonian Institution Press,  1982 
 - 35 p. :  ill. ;  26 cm. 
 - Smithsonian contributions to paleobiology ;  no.47 .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protosciurus