The American Library Association (ALA) is a library collection guide which was created so that libraries could have a comprehensive and scholarly list of literature to purchase for their library. This idea of a universal guide for all American libraries was championed by Melvil Dewey, the creator of the Dewey Decimal Classification. It was first revealed at the Chicago World Fair in 1893 and has been used as a valuable resource for libraries since that time. It is especially pertinent to the study of lesbian and gay representation in libraries, because these lists had a massive pull in what libraries would order and display. Reviews done for books with lesbian and gay material in it displayed the feelings of that time. In the 1920s, words like "sinister" and "daring" were used to describe books with a lesbian motif in reviews for A.L.A Catalog. It was rare for libraries pre Stonewall era to acquire books with adequate representation of the LGBT+ community as they heavily relied on mainstream reviews and book lists for their collection. The librarians own prejudices also influenced the purchasing of collections. In 1908, the president of the A.L.A. stated that the New York Public Library, where he worked, would not purchase books that he deemed were "immoral or so indecent that they are unfit to be circulated in the general public."