Crockett, C W <br/><br/>
Elements of plane and spherical trigonometry 

 -  American Book Co., New York  1896 
 - 103 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry; Mathematics
<br/><br/><label>Dewey Class. No.: </label>516.24  CRO-E