00363cam a2200145 4500 0471680710 543 PER Perrin, D. D. Masking and demasking of chemical reactions; New York, Wiley-Interscience [1970] x, 211 p. illus. Masking (Chemistry) chemistry REF 322 322 0 0 0 NFIC IC IC GEN 2015-03-02 0 543 PER 004919 2015-03-02 00:00:00 REF