Orbis Latinus Online The standard print equivalent: J.G.T. Graesse, F. Benedict, and H. Plechl. Orbis Latinus: Lexikon lateinischer geographischer Namen des Mittelalters und der Neuzeit, (1972).
Also of note is R. A. Peddie's Place Names in Imprints: An Index to the Latin and Other Forms Used on Title Pages (1986).
Early English Books Online (EEBO) Digital copies of books printed in England, Scotland, and Ireland, as well as works in English printed elsewhere. A nearly comprehensive representation of items cited in Pollard and Redgrave's Short-Title Catalogue (1475-1640), Wing's Short-Title Catalogue (1641-1700), and the Thomason Tracts Collection.
Early European Books Traces the history of printing in Europe from its origins through to the close of the 17th century, offering full-color, high-resolution facsimile images of rare and hard-to-access printed sources.
Bibliographies and Catalogues: