TY - RPRT TI - Development of methods of test for quality control of porcelain enamels: progress report July 1, 1968 through September 30, 1968 AU - Burdick, M D PY - 1968 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 9944 DO - 10.6028/NBS.RPT.9944 ER -