• Association for Preservation Technology International (APT)
• Cultural Landscape Foundation, The
• National Trust for Historic Preservation
• Old Houses
• Preservation Action
• PreservationDirectory.com
• Preservation Magazine, National Trust

Schools
With Historic Preservation and History programs

• Masters In History
• Goucher College, Master of Arts in Historic Preservation

Cultural Landscapes & Gardens

• Alliance for Historic Landscape Preservation
• American Garden and Landscape History
• American Society of Landscape Architects

Architecture, Architect Societies & Organizations

• American Institute of Architects
• Borrego Modern
• Cabrillo National Monument
• California Missions Studies Association
• Calvary Cemetery, Mission Hills (now Pioneer Park)
• Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER), and Historic American Landscapes Survey (HALS), Library of Congress
• Historic Context Reports
• Modern San Diego
• National Register of Historic Places
• National Register of Historic Places in San Diego County
• San Diego Public Library Periodical Holdings
  in Architecture and Design
• Save the Windows
• Say No to Vinyl Windows
• Society of Architectural Historians
• Society of Architectural Historians, Southern California Chapter
• Vinyl Windows

Historical Societies & Preservation Organizations

• Boosters of Old Town
• California Preservation Foundation
• Center for Understanding the Built Environment (CUBE)
• Hillquest An Urban Guide to 92103
• Italian Historical Society of San Diego
• Italian Humanities
• Lambda Archives of San Diego - San Diego LGBT History
• LaPlayaHeritage.com
• Los Californianos
• Mission Hills Heritage
• Neighborhood Historic Preservation Coalition
• Recent Past Preservation Network
• San Diego History Center
• San Pasqual Battlefield Site Location Project
• Santee Historical Society
• Teaching with Historic Places
• Tile Heritage Foundation

Historic Sites, Landmarks, & Museums

• Museums USA
• National Register of Historic Places listings in San Diego County, California
• Stein Family Farm
• Whaley House Operated by SOHO

Advocacy: Law, Regulations & Incentives

• USC Libraries

Research & Archives

• American Memory Historical Collections
• California Ephemera Project
• California Historical Society
• Chronicling America
• Ghost Signs
• Historic Contexts Library
• Lambda Archives of San Diego - San Diego LGBT History
• San Diego Yesterday
• US Interstate Highway System & President Dwight Eisenhower

Government Agencies & Policies

• Advisory Council on Historic Preservation
• Advisory Council on Historic Preservation - Policy Statement on Affordable Housing & Historic Preservation
• California Environmental Quality Act (CEQA) (57-page pdf)
• Department of the Interior
• Federal Bureau of Land Management
• Federal Historic Preservation Tax Incentives
• Historic Site Board, County of San Diego
• National Center for Preservation Technology & Training
• National Endowment for the Humanities
• National Park Service
• NEPA & NHPA: A Handbook for Integrating NEPA and Section 106 (50-page pdf)
• San Diego Convention & Visitors Bureau
• San Diego County Parks and Recreation Department
• Secretary of the Interior's Standards for Rehabilitation
• Secretary of the Interior's Standards for the Treatment of Historic Properties
  (182-page pdf)
• Section 106 (16-page pdf)
• State Historic Preservation Legislation Database
• State Historic Preservation Office of California
• Statewide Historic Preservation Plan
• Tax Incentives
• U.S. Department of the Interior

Restoration & Technology Resources

• Arts & Crafts Collector
• California Futures Network
• Certificate in Historic Preservation University of Southern California
• Legacy 106, Inc., Archaeology & Historic Preservation Consultants

Cultural

• Los Californios Perform the music of early California
• San Diego Archaeological Center
• San Diego Nonprofit Environmental Events & Organization Directory