Ulrich's international periodicals directory : 1993-94 : including irregular serials & annuals : Vol. 4 :Indexes. - 32nd ed. - Bowker, 1993. - Ixii, 5455-7735 p. - A Bowker serials bibliography .

Ulrich's plus Ulrich's on disc Ulrichsweb.com <> Bowker serials bibliography / Supplement to Ulrich's international periodicals directory and Irregular serials and annuals Ulrich's quarterly <> Bowker international serials database update Ulrich's update

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