TY - RPRT TI - Collaborative reference program for color and appearance : ASTM 60� gloss report no. 28 AU - Cummings, T L AU - Horlick, J PY - 1979 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 79-1810 DO - 10.6028/NBS.IR.79-1810 ER -