ap42_phs_1968 (pdf) (2.02 MB) ap42_1sted_1971 (pdf) (6.55 MB) ap421sted_1972 (pdf) (8.33 MB) ap42_2nded_orig_april1973 (pdf) (9.33 MB) ap42_2ndsup1_july1973 (pdf) (1. ...
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