All of the continents and every country situated within, the UNITED STATES and each of the constituent states arranged by region, CANADA and each of its provinces, AUSTRALIA and each of its states, the major bodies of water and major islands on both hemispheres, and selected major cities. Although the geographic locations are not printed in INDEX MEDICUS as main headings, in indexing they are significant in epidemiologic studies and historical articles and for locating administrative units in education and the delivery of health care.