WorldCat A catalog for libraries worldwide contains citations for books, journals, manuscripts, maps, music scores, sound recordings, films, computer files, newspapers, slides, and videotapes.
3 Percent (University of Rochester) Free resource that can be downloaded going back to 2007 for works that have been translated into English (Excel Spreadsheets)
Index Translationum (UNESCO) The Index Translationum is a list of books translated in the world, i.e. an international bibliography of translations. The data base contains cumulative bibliographical information on books translated and published in about one hundred of the UNESCO Member States since 1979 and totalling more than 1,500.000 entries in all disciplines.