TY - BOOK ID - 135074424 TI - Trigonometry AU - Gelfand, I.M. AU - Saul, M. PY - 2001 SN - 0817639144 PB - S.l. Birkhauser DB - UniCat KW - Plane trigonometry UR - https://www.unicat.be/uniCat?func=search&query=sysid:135074424 AB - ER -