TY - GEN AU - Waldron, Leo J AU - Snoke, Hubert R C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1940-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.BMS.57 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1940 TI - Roofing in the United States ::results of a questionnaire ER -