A photographic study of the proper motion of nearby stars / 
Peter Van De Kamp. 
 -  American Philosophical Society,  1944. 
 - 372 - 374 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stars
<br/><br/><label>LC Class. No.: </label>SPE-B 06630