Prior to the initiation of cultural survey on-the-ground, many agencies require a Class I literature review to be conducted. This helps ensure that sites are evaluated in proper context and that field personnel are abreast of what potentially significant site types may be in the area. Occasionally, such historic research documents are requested by federal representatives as part of the project mitigation process or by private clients with a special interest in a battlefield, landmark, or other historic site. We conduct research of land patents, GLO records, state-held site and project inventories, key cultural contexts of the area, and other pertinent resources based on the project's scope and known cultural history of the area in question. Access to some of these resources requires an Archaeological Resources Protection Act, or ARPA permit, which ACR holds.