Scope and Contents The University purchased several houses to be used for fraternities and sororities in 1951, including the Angell House -- Alpha Sigma Tau Sorority; Bryson House -- Sigma Sigma Sigma Sorority; Droegmueller House -- Pi Kappa Sigma Sorority; Harper House -- Lambda Gamma Kappa Fraternity; Stevens House -- Sigma Kappa Sorority; and Warren House -- Delta Delta Tau Fraternity. Source: Board of Trustees Minutes, Apr. 18, 1951 and Oct. 4, 1951 (Trustees Minutes Colorado State College of Education...