The Historic Preservation Training Center (HPTC) is dedicated to the safe preservation and maintenance of national parks or partner facilities by demonstrating outstanding leadership, delivering quality preservation services, and developing educational courses that fulfill the competency requirements of Service employees in the career fields of Historic Preservation Skills, Risk Management, Maintenance, and Planning, Design, and Construction.

An organization, not a specific historical site.

The Alliance seeks to preserve the heritage of the communities involved, promoting economic development and tourism, and interpreting the history and culture of the valley.

Seems to be more an umbrella organization than associated with individual historical sites.

The purpose of the Saugus Historical Society is to cultivate an interest in the history of the town and collect and preserve all matter pertaining to the town's history and citizenry. The organization was begun in 1928.

Does not appear to be affiliated with a specific historical site.

Founded in 1962 on the campus of Stephen F. Austin State University in Nacogdoches, the Association is committed to the preservation and enhancement of East Texas's great historical heritage.

Does not appear to be affiliated with any specific historical sites.