1. Frank C. Laubach, teacher of millions / by David E. Mason. Mason, David E. Minneapolis : T. S. Denison, [1967] Book Physical ReCAP NK9 L36 M39
2. Dr. Albert Schweitzer, medical missionary ; a biographical sketch of a man who has dedicated his life to others / By Kurt Singer and Jane Sherrod. Singer, Kurt D., 1911-2005 Minneapolis : T.S. Denison, [1962], [©1962] Book Physical ReCAP TM43.69 S61