00515nam a2200169Ia 4500 0000016289 20251012174544.0 s1991 xx eng c 9211165202 TP1120 Engineering plastics Economic Commission for Europe New York United Nations 1991 107 p 30 cm. "ECE/CHEM/81." "United Nations publication sales no. E.91.II.E.32."--T.p. verso Bibliography: p. 90-91 xxx 6080 6080