TY - BOOK T1 - Brief trigonometry;a text in twenty assignments DA - [c1941] CY - New York, AU - Crathorne, A. R. AU - Moore, Gerald E. CN - QA533 .C853 CN - QA533 PB - H. Holt and company PP - New York, PY - [c1941] ID - 64833 KW - Plane trigonometry. KW - Logarithms. TI - Brief trigonometry;a text in twenty assignments ER -