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California Missions Studies Association

A nonprofit group devoted to the study and preservation of the 21 missions and related buildings of early California. Mission directory, articles, reviews, glossary, bibliographies, projects, news and events.
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California Preservation Foundation

Non-profit organization dedicated to the preservation and enhancement of California's historic built environment. Aims, membership, event calendar, publications, case studies.
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Cambridge Historical Commission

Protects historic buildings in Cambridge, Massachusetts, marks historic sites, advises owners of historic buildings on preservation, researches and publishes on the city's architectural history.
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Cinema Treasures

Dedicated to saving classic movie theaters in the US. News, database, photographs, virtual tours and message boards. Also aims, founders, sponsors and volunteer staff of the web-site.
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Landmarks Preservation Council of Illinois

Statewide not-for-profit membership organization dedicated to the preservation of Illinois's architectural and historic resources. Membership, events, programs, current issues.
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Los Angeles Conservancy

Historic preservation organization. Conservation alerts and issues, events, walking tours, volunteer opportunities.
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New Jersey Historic Preservation Office

Official website provides information and technical assistance for the identification, protection, and preservation of architectural and archaeological resources.
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Providence Preservation Society

A non-profit, advocacy organization, offering historic house, garden and walking tours of Providence, Rhode Island, as well as technical advice to owners of historic buildings.
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