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(A) General Bibliographies.........................HBB (B) National Bibliographies........................HBD (C) Subject Bibliographies.........................HBF (D) Collective and Personal Bibliographies.........HBH (E) Library Science and Services...................HBK (F) Acquisitions, Collections, and Catalogs........HBN (G) Reference Works and Research...................HBQ (H) General Works..................................HBT