"The Classification covers the field of medicine and its related sciences. With it are used the various schedules of the Library of Congress Classification in order to provide an orderly arrangement for subjects bordering on medicine and for non-medical reference books. The LC schedules are used extensively; for example, social questions relating to the blind and the deaf are classified in HV (Social Sciences). When classification according to the LC schedules is indicated, only the class letters have been furnished in the present index. Specific numbers for LC classes have been omitted on the theory that each library will determine for itself the amount of specificity it desires in its use of the LC Classification tables. At AML, specific subdivisions of more general classes are used only when it appears that the number of titles to be classified will justify their use."