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Dissertations

• Z 5053-5055 is used for bibliographies of general dissertations

• ZQS-ZWZ, ZSF is used for bibliographies of dissertations of schools of dentistry, medicine, nursing, pharmacy, public health, veterinary medicine, etc.

NLM Historical Collection

• ZW 4 is used for bibliographies of dissertations of foreign schools of dentistry, medicine, nursing, pharmacy, public health, veterinary medicine, etc.
• W 4A is used for American dissertations on clinical research arranged by author. ZW 4A is used for the bibliographies. Classify dissertations which qualify as Americana in WZ 270