The Degolyer Library at Southern Methodist University
The Degolyer Library at Southern Methodist University holds more than 1,000,000 photographs and prints. It is keyword searchable:
Of particular interest for readers of this page are the Lawrence T. Jones III Texas photographs collection, here:
Also, the George W. Cook Dallas/Texas image collection, here:
Finally, the Robert Yarnall Ritchie photograph collection, while not comprised solely of photographs from Texas, has many Texas images. It's here:
Texanness is next to godliness.