TY - RPRT TI - Structural properties of a wall construction of "knap concrete wall units" sponsored by Knap America Inc. AU - Whittemore, Herbert L AU - Stang, Ambrose H AU - Fishburn, Cyrus C PY - 1940 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS BMS 40 DO - 10.6028/NBS.BMS.40 ER -