Zenon, the catalogue of the Deutsches Archaologisches Institut. Much of the same information as DYABOLA, only through a free interface. Included in this catalog are not only books held by the libraries, but a full index to the journals and collected volumes. You can also search by the DYABOLA subject headings (the "Systematic Access to the DAI Bibliographies (Thesaurus)" link). "Search" allows keyword and browse (alphabetical list) searches. Results will be books or articles; results that are articles will have an "Uplink" link that will take you to the record for the journal or collected volume, from which a "downlink" will take you to the full table of contents of the volume. There is good coverage of Greek Turkish archaeology. This catalogue is in Unicode, so you can search for Greek titles in Greek. (quoted from an entry on a guide for Classical and Near Eastern Archaeology, Bryn Mawr; Camilla MacKay, Librarian).
The Unione Romana Biblioteche Scientifiche is a network of research libraries in Rome established in 1992 to create an on-line union catalog. Twelve major libraries contribute their records to the union catalog. Links are also provided to the catalogs of the individual libraries. Participating libraries include the American Academy in Rome and British School of Rome. As of 2011, the union catalog consists of 500,000 bibliographic record. Included are records for books, periodicals, photographs, prints, electronic resources, maps, and musical scores.