Sources for researching historical buildings or sites:
- Fire Insurance Maps
- Aerial Photography
- Beryl Ford Collection Images
- Tulsa County Land Records
- City of Tulsa Atlas
- City Directories
Fire Insurance Maps:
Sanborn fire insurance maps include a wealth of information about buildings in urban places. The maps were published in color to denote various types of building construction, such as wood frame, stone, brick, concrete, and exterior metal cladding. For Tulsa, black and white scans of the maps are available online through the Tulsa City-County Library System. The earliest map is from 1894 and the most recent is from 1962.
High altitude United States Geological Survey (USGS) aerial photography is also available online through the Tulsa City-County Library.
For more images, see the USGS EarthExplorer website: http://earthexplorer.usgs.gov/
Beryl Ford Collection Images:
Over several decades, Beryl Ford collected tens of thousands of images chronicling Tulsa's history. Many images from the Beryl Ford Collection are available online through the Tulsa City-County Library. Note: Some photos are misidentified and many are unidentified.
Tulsa County Land Records:
The Tulsa County Clerk's Office has some land records online: http://www.countyclerk.tulsacounty.org/land.htm
For the very old records, I prefer to go the County Clerk's Office in person to search through the hand-written ledgers, the plat maps, and look for specific document filings on the digital reel system.
The Tulsa County Assessor's Office has real estate records online, too: http://www.assessor.tulsacounty.org/
There are various methods of searching the County Assessor's online records, such as by street address, by property owner's name, or by parcel number.
City of Tulsa Atlas:
Thorne's Atlas of Tulsa, published in 1937, is a valuable resource
Some available online through the Oklahoma Historical Society's "Gateway to Oklahoma History" portal. Most sheets are scanned in enough detail to search for words and phrases
All years from 1909 to 1935 inclusive, except for 1915, have been scanned. Available through TCCL, Ancestry Library Edition.