TY - RPRT TI - Adhesive restorative materials : progress report AU - Bowen, R L AU - Barton, J A AU - Mullineaux, A L PY - 1971 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 10598 DO - 10.6028/NBS.RPT.10598 ER -