Whittaker, E. T.  1873-1956. <br/><br/>
The calculus of observations;:  a treatise on numerical mathematics/ 
by Sir Edmund Whittaker and G. Robinson. 
 - 4th ed. 
 - London:  Blackie & Son,  [1954]. 
 - 397 p.:  diagrs., tables (part fold.);  23 cm. 
<br/><br/> "Ninth impression (fourth edition) 1944, reprinted ... 1954."  "Answers to examples": p. 385-388. 
<br/><br/><label>Dewey Class. No.: </label>518  / W624c