Natural sines and cosines to eight decimal places /  
Coast and Geodetic Survey. 
 - Washington :  U.S. Govt. Print. Off.,  1942. 
 - 541 p. of tables.  28 cm. 
 - Its Special publication .
<br/><br/> At head of title: U.S. Dept. of Commerce, Jesse H. Jones, secretary. Coast and Geodetic Survey, Leo Otis Colbert, director ... 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TRIGONOMETRIA
<br/><br/><label>Universal Decimal Class. No.: </label>515