TY - RPRT TI - Studies on the photodegradation of poly (methyl methacrylate) AU - Abouelezz, Mohamed AU - Waters, P F PY - 1979 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 79-1766 DO - 10.6028/NBS.IR.79-1766 ER -