The Emerald of Sigma Pi, Vol. 58, No. 1, Spring 1971 The Emerald of Sigma Pi, Vol. 58, No. 2, Summer 1971 The Emerald of Sigma Pi, Vol. 58, No. 3, Fall 1971 The Emerald of Sigma Pi, Vol. 58, No. 4, Winter 1971 The Emerald of Sigma Pi, Vol. 59, No. 1, Spring 1972 The Emerald of Sigma Pi, Vol. 59, No. 2, Summer 1972 The Emerald of Sigma Pi, Vol. 59, No. 3, Fall 1972 The Emerald of Sigma Pi, Vol. 59 No. 4, Winter 1973 The Emerald of Sigma Pi, Vol. 60, No. 1, Spring 1973 The Emerald of Sigma Pi, Vol. 60, No. 2, Summer 1973 The Emerald of Sigma Pi, Vol. 60, No. 3, Fall 1973 The Emerald of Sigma Pi, Vol. 60, No. 4, Winter 1974 The Emerald of Sigma Pi, Vol. 61, No. 1, Spring 1974 The Emerald of Sigma Pi, Vol. 61, No. 2, Summer 1974 The Emerald of Sigma Pi, Vol. 61, No. 3, Fall 1974 The Emerald of Sigma Pi, Vol. 61, No. 4, Winter 1975 The Emerald of Sigma Pi, Vol. 62, No. 1, Spring 1975 The Emerald of Sigma Pi, Vol. 62, No. 2, Summer 1975 The Emerald of Sigma Pi, Vol. 63, No. 3, Fall 1975 The Emerald of Sigma Pi, Vol. 63, No. 4, Winter 1976