This document is a preliminary study of the listings of a wide variety of regional/split-run editorial practices of major American periodicals. Publications chosen for the study were selected from the tenth edition of "Magazine Regional and Split-Run Advertising," published by the Magazine Advertising Bureau of the Magazine Publishers Association. Criteria for the selection of publications to be queried included the stipulation that a given magazine produce more than six regional/split-run editions on a regular basis. Thirty-nine magazines were queried and the editors or other editorial department representatives of 25 of the magazines responded. Magazines responding included "Good Housekeeping,""Woman's Day,""Farm Journal,""Holiday," and "Life." Results indicated that the national magazine has not been destroyed by the computerization of publishing operations and the specialized interests of advertisers and that the editorial department still controls the production of the editorial material that goes to the readers. The remainder of the document is a magazine-by-magazine review of the editorial practices of the 25 periodicals responding to the questionnaire. (RB)