Maps

• Houston Historic District Maps: Local designated district maps; PDFS in "Boundaries" section of each district page
• Houston Past
• Library of Congress Historic Maps
• Sanborn Fire Insurance Maps: 1877-1907, color maps, University of Texas, open access
• Sanborn Fire Insurance Maps: 1885-1955, black and white maps; Houston Public Library, card required
• Texas Historic Sites Atlas, Texas Historical Commission: State and National historic designated properties

Newspapers

• Library of Congress Chronicling America: Historic American Newspapers
• Houston Public Library Newspapers Resources Online  HPL card required

Audio & Video

• Houston Oral History Project
• Texas Archive of the Moving Image: movies, films, ads, television, corporate productions

Photographs

• University of Houston Digital Library Photograph Collections

Multiple Media

• Harris County Appraisal District: property information, parcel maps
• Harris County Archives: building and land assessment cards and photos
• Library of Congress, American Memory: maps, manuscripts, video, music, photos, recordings, books and more
• Texas Archival Resources Online: search engine for multiple collections throughout Texas
• Woodson Research Center: Rice University special collections, digital and physical materials
• Houston Area Digital Archive: Houston Public Library 
• Portal to Texas History: University of North Texas database of multiple types of materials from multiple sources
• Clayton Library Center for Genealogical Research: digital and physical materials
• Museum of Houston: digital and physical materials from multiple collections
• Houston Freeways: book, maps & photos
• Briscoe Center for American History: University of Texas at Austin, digital and physical materials

Local, State and Federal Historic Preservation Programs & Tax Incentives

Houston

• Historic Preservation Office: Houston Planning & Development Department
• Houston Archaeological and Historical Commission (HAHC)
• HAHC Meeting Documents 
• HoustonPreservation.org: HAHC Blog
• Planning a Project: guidance for working on locally historic designated properties
• Historic Districts:  property lists, maps, photos, defining characteristics
• Landmarks and Protected Landmarks
• Historic Landmark & Protected Landmark Plaque Order Form: (PDF) 
• Economic Incentives for Historic Buildings (PDF)

Harris County

• Harris County Historic Site Tax Exemption 

Texas

• Texas Historic Sites Search 
• Texas Historical Commission (THC)

United States

• National Register of Historic Places 
• Federal Historic Preservation Tax Incentives Program 

Design Standards and Technical Recommendations

• Historic Preservation Manual: City of Houston
• Preservation Briefs: National Park Service
• The Secretary of the Interior’s Standards 

Preservation and History Organizations

Houston

• AIA Houston Historic Resources Committee
• The Heritage Society at Sam Houston Park
• Historic Houston
• Houston Mod
• Preservation Houston 
• Pier and Beam, Preservation Houston

Texas

• Preservation Texas

National

• AIA National Historic Resources Committee
• Association for Preservation Technology
• Docomomo US
• National Trust for Historic Preservation