TY - RPRT TI - Circular of the Bureau of Standards no. 436: low-cost glazes for structural clay products AU - Stull, Ray T AU - Johnson, Paul V PY - 1942 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS CIRC 436 DO - 10.6028/NBS.CIRC.436 ER -