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In order to discern the effect of Anglo-American Cataloguing Rules, 2nd edition1 (AACR2) on the bibliographic records found in union lists of serials, it is necessary first to analyze such records as they currently exist in union lists. One similarity soon becomes apparent when perusing dif­ ferent union lists of serials compiled in the United States: The cataloging therein (descriptive cataloging, choice and form of entry) varies widely from list to list. For the most part, the data contained in the descriptive cataloging areas appear in a more abbreviated form than is found in, say, a Library of Congress cataloging record. Union list editors have selected certain fields and elements from the full record for the purpose of the union list. In many union lists of serials, this information is exceptionally brief. Choice of entry in a number of union lists examined was strictly by title even though the cataloging rules at the time of compilation indicated specific instances for the use of corporate entry. If there was an entry other than title (i.e., personal, corporate or geographic name) it most likely was based on the cataloging practices of the time or on Library of Congress precedent.