TY  - BOOK
AU  - Hall,H.S.
AU  - Knight,S.R.
TI  - Elementary trigonometry,
AV  - QA533 .H22 1919
U1  - 516.24 HAL K 
PY  - 1967///
CY  - London
PB  - Macmillan and co., limited
KW  - Plane trigonometry
ER  -