Attachment For Surveying Instruments, patent, September 6, 1904; (https://texashistory.unt.edu/ark:/67531/metapth514007/m1/1/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Attachment For Surveying Instruments, patent, September 6, 1904; (https://texashistory.unt.edu/ark:/67531/metapth514007/m1/1/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .