TY - GEN AU - A T McPherson C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1931-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.393 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1931 TI - Circular of the Bureau of Standards no. 393::reclaimed rubber ER -