Introduction._____________________________________________________ 177 Bibliographies of uranium._________________________________________ 179 Annotated bibliography ____________________________________________ 181 Indexes: Authors. __ _____________________________________________ 201 Geographic areas._____________________________________________ 202 Stratigraphic units___________________________________________ 202 Subjects.________________________________________ 203 ILLUSTRATION PLATE 1. Index map of the United States showing location of native bituminous substances, exclusive of coals, that have been tested for uranium or radioactivity_