The Advanced Papyrological Information System (APIS) is a collections-based repository hosting information about and images of papyrological materials (e.g., papyri, ostraca, wood tablets, etc.) located in collections around the world. It contains physical descriptions and bibliographic information about the papyri and other written materials, as well as digital images and English translations of many of these texts. When possible, links are also provided to the original language texts (e.g., through the Duke Data Bank of Documentary Papyri). The user can move back and forth among text, translation, bibliography, description, and image. With the specially-developed APIS Search System many different types of complex searches can be carried out. APIS includes both published and unpublished material.