Some libraries utilize BISAC and librarians are also members of the BISG Subject Codes Committee.
From the Book Industry Study Group:
The BISAC Subject Headings List, 2014 Edition package includes Excel, Word, and PDF formats of the full subject headings list, along with a license allowing the codes to be incorporated into internal systems for unlimited use.
2014 marks the 20th edition of the BISAC Subject Headings List. This update includes 71 additions; among them, 11 new Fiction headings including a FICTION/Erotica tree and 14 new headings in Literary Criticism. The most extensive changes overall were made in the Travel category.
The BISAC Subject Headings are maintained by BISG’s Subject Codes Committee, chaired for the 10th year by Connie Harbison of Baker & Taylor. Committee members represent major publishers, wholesalers and other data aggregators, libraries and library service providers, and retailers. The Committee makes changes based on a careful evaluation of requests from both publishers and individual BISAC code users, often independent authors.