TY - RPRT TI - Development of methods of test for quality control of porcelain enamels : progress report April 1 through June 30, 1964 AU - Wolfe, Winthrop C PY - 1964 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 8535 DO - 10.6028/NBS.RPT.8535 ER -