TY  - BOOK
AU  - Welchons,A.M.
AU  - Krickenberger, W. R.
AU  - Pearson, Helen R.
TI  - Modern trigonometry
AV  - QA531 .W32
U1  - 514 
PY  - 1962///]
CY  - Boston
PB  - Ginn and Company
KW  - Trigonometry
ER  -