TY  - BOOK
AU  - Durell,Clement V.
AU  - Robson,A.
TI  - Advanced trigonometry/ 
U1  - 516 .24   23
PY  - 1934///
CY  - London: 
PB  - G. Bell and Sons, ltd., 
KW  - Trigonometry
N1  -  "First published 1930. Reprinted 1934.";  includes index
ER  -