TY - RPRT TI - Radiopaque denture base materials technic dentures : 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 10274 DO - 10.6028/NBS.RPT.10274 ER -