528.019 BIOTECHNOLOGY AND BIOENGI- NEERING SYMPOSIUM nr.6 Enzymatic conversion of cellulosic materials: technology and applications,Symposium Proceedings,held at Newton and Natick,Massachusetts. September 8-10,1975 Ed. Elmer L. Gaden, jr. /et al./ New York 1976 An interscience Publ. 8° s. VI, 319, nlb. 2. Biotechnology and Bioengine-ring Symposium nr 6