TY - RPRT TI - Compressive properties of hard tooth tissues and some restorative materials: progress report AU - Stanford, John W AU - Paffenbarger, George C AU - Sweeney, W T PY - 1959 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 6406 DO - 10.6028/NBS.RPT.6406 ER -