The Emerald of Sigma Pi, Vol. 17, No. 4, January 1931 The Emerald of Sigma Pi, Vol. 18, No. 1, April 1931 The Emerald of Sigma Pi, Vol. 18, No. 2, July 1931 The Emerald of Sigma Pi, Vol. 18, No. 3, November 1931 The Emerald of Sigma Pi, Vol. 18, No. 4, January 1932 The Emerald of Sigma Pi, Vol. 19, No. 1, April 1932 The Emerald of Sigma Pi, Vol. 19, No. 2, July 1932 The Emerald of Sigma Pi, Vol. 19, No. 3, November 1932 The Emerald of Sigma Pi, Vol. 19, No. 4, February 1933 The Emerald of Sigma Pi, Vol. 20, No. 1, May 1933 The Emerald of Sigma Pi, Vol. 20, No. 2, August 1933 The Emerald of Sigma Pi, Vol. 20, No. 3, November 1933 The Emerald of Sigma Pi, Vol. 20, No. 4, February 1934 The Emerald of Sigma Pi, Vol. 21, No. 1, May 1934 The Emerald of Sigma Pi, Vol. 21, No. 2, August 1934 The Emerald of Sigma Pi, Vol. 21, No. 3, November 1934 The Emerald of Sigma Pi, Vol. 21, No. 4, February 1935 The Emerald of Sigma Pi, Vol. 22, No. 1, May 1935 The Emerald of Sigma Pi, Vol. 22, No. 2, August 1935 The Emerald of Sigma Pi, Vol. 22, No. 3, November 1935