The eHRAF Collection of Archaeology is modeled after the eHRAF Collection of Ethnography. It provides researchers and students access to archaeological materials for comparative studies within and across regions. Annual installments cover eight or more major archaeological/cultural traditions from around the world with at least 10,000 pages indexed according to a modified Outline of Cultural Materials (OCM) for quick retrieval of information. Each major tradition typically contains an overview by an expert and descriptive materials on 5 to 7 sites. HRAF indexes the information in its collection of ethnography by culture and subject. OWC is an acronym for the Outline of World Cultures, a systematic listing of the cultures of the world; an OWC code, or OWC number, is a culture identification code. The OWC number is a four character alpha-numeric id derived from the classification scheme presented in the Outline of World Cultures. Each distinct culture in the list of Cultures Covered in eHRAF is assigned an OWC number and text on that culture has been indexed using that OWC. OCM stands for "Outline of Cultural Materials", a thesaurus-like listing of subject descriptors used to index the texts included in the eHRAF Collections. An OCM code, or OCM number, is a three-digit numeric code for a subject descriptor that is decribed in the Outline of Cultural Materials. The OCM lists approximately eighty broad terms and over seven hundred narrower terms that are used to index the texts at the paragraph level. Both the OWC and OCM lists are browsable in the Web version of HRAF.