TY  - BOOK
AU  - Crowder, Norman A.,
AU  - Martin, Grace C.
CN  - QA537 .C74
CY  - Garden City, N.Y.,
DA  - [c1961]
ID  - 58645
KW  - Trigonometry
KW  - Programmed instruction.
PB  - Doubleday
PP  - Garden City, N.Y.,
PY  - [c1961]
T1  - Trigonometry:a practical course.
TI  - Trigonometry:a practical course.
ER  -