Balthaser H,  <br/><br/>
Two Say Why 

 - New York  Sheed and Ward  1976 
<br/><br/><label>Subjects--Uniform Titles: </label>--GENERAL STACK
<br/><br/><label>Subjects--Topical Terms: </label><br/>NATURAL SCIENCE& MATHEMATICS--CELESTIAL MECHANICSGeneralia--ASTRONOMY & ALLIED SCIENCE
<br/><br/><label>Dewey Class. No.: </label>521.18  / BAL-T