1970 - 1979 Originally released from 1971-1979, read Volumes 7-15 of Parabola magazine. The issues covered the fascinating subjects of algebraic topology and tackled challenging problems like chessboard configurations and magic squares. Year 1979- Volume 15 Year 1978- Volume 14 Year 1977- Volume 13 Year 1976- Volume 12 Year 1975- Volume 11 Year 1974- Volume 10 Year 1973- Volume 9 Year 1972- Volume 8 Year 1971- Volume 7