TY  - BOOK
AU  - Durell,C.V., Robson, A.
AU  - x
TI  - Advanced trigonometry: x
SN  - x
U1  - 514/DUA 
PY  - 1937///
CY  - London
PB  - G. Bell and sons
KW  - Trigonometry
N1  - x
ER  -