TY - RPRT TI - Development of a radiopaque denture base material : progress report AU - Chandler, H H AU - Bowen, R L AU - Paffenbarger, G C PY - 1970 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 10272 DO - 10.6028/NBS.RPT.10272 ER -