The eHRAF Collection of Archaeology is a cross-cultural database that currently contains information on the world's prehistory. This unique database is organized by archaeological traditions and the full-text sources are all subject-indexed to the paragraph level. The eHRAF databases are produced by Human Relations Area Files, Inc. (HRAF) at Yale University. The mission of HRAF, a non-profit consortium of universities and colleges, is to encourage and facilitate worldwide and other comparative studies of human behavior, society, and culture.It is a unique resource designed to facilitate comparative archaeological studies.