TY  - BOOK
AU  - Crowder,Norman A.
AU  - Martin,Grace C.
TI  - Trigonometry : : a practical course 
T2  - A Tudor text
U1  - 516.24 23
PY  - 1961///
CY  - Garden City, N.Y.
PB  - Doubleday
KW  - Trigonometry
KW  - Problems, exercises, etc
KW  - Programmed instruction
N1  - Includes Indexes
ER  -