The Emerald of Sigma Pi, Vol. 48, No. 1, Spring 1961 The Emerald of Sigma Pi, Vol. 48, No. 2, Summer 1961 The Emerald of Sigma Pi, Vol. 48, No. 3, Fall 1961 The Emerald of Sigma Pi, Vol. 48, No. 4, Winter 1962 The Emerald of Sigma Pi, Vol. 49, No. 1, Spring 1962 The Emerald of Sigma Pi, Vol. 49, No. 2, Summer 1962 The Emerald of Sigma Pi, Vol. 49, No. 3, Fall 1962 The Emerald of Sigma Pi, Vol. 49, No. 4, Winter 1963 The Emerald of Sigma Pi, Vol. 50, No. 1, Spring 1963 The Emerald of Sigma Pi, Vol. 50, No. 2, Summer 1963 The Emerald of Sigma Pi, Vol. 50, No. 3, Fall 1963 The Emerald of Sigma Pi, Vol. 50, No. 4, Winter 1964 The Emerald of Sigma Pi, Vol. 51, No. 1, Spring 1964 The Emerald of Sigma Pi, Vol. 51, No. 2, Summer 1964 The Emerald of Sigma Pi, Vol. 51, No. 3, Fall 1964 The Emerald of Sigma Pi, Vol. 51, No. 4, Winter 1965 The Emerald of Sigma Pi, Vol. 52, No. 1, Spring 1965 The Emerald of Sigma Pi, Vol. 52, No. 2, Summer 1965 The Emerald of Sigma Pi, Vol. 52, No. 3, Fall 1965 The Emerald of Sigma Pi, Vol. 52, No. 4, Winter 1966