TY - `BOOK` AU - Ackermann, Robert John TI - Modern deductive logic : an introd. to its techniques and significance PB - Macmillan CY - London PY - 1970 LA - eng SE - 261 S. T2 - Modern introductions to philosophy CN - <PI> 120 Ack 2 AN - UBHD-1006980 ER -