At his death, Felix Jacoby left to posterity a monumental work assembling the fragments of the work of more than 870 Greek historians. Yet the sheer bulk of the material make it difficult to use. These indexes aim to facilitate access to the corpus of fragments and to improve its usefulness. Index 1 places all sources of fragments in a list alphabetized by author and work, index 2 follows the order of presentation found in Jacoby, while index 3 places the authors of fragments in alphabetical order and gives under each one an alphabetized list of authors who cite him.