Northrup, Edwin F.  b. 1866 <br/><br/>
Laws of physical science :  a reference book / 
by Edwin F. Northrup 
 - Philadelphia :  J. B. Lippincott,  1917 
 - vii, 210 p. ;  20 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics<br/>Physical laws<br/>Physical Science
<br/><br/><label>Dewey Class. No.: </label>520