Elsas, Oscar, 1871-1924. "Letter from Oscar Elsas to Walter Drew, National Erectors' Association." Georgia Institute of Technology. Library. Archives, Records Management and Digital Curation Department . 1915-07-07, https://exhibit-archive.library.gatech.edu/fulton_bag/itemd9f9.html?collection=ms004&filename=ms004-112.xml.

Elsas, Oscar, 1871-1924 (1915-07-07). Letter from Oscar Elsas to Walter Drew, National Erectors' Association. Retrieved from https://exhibit-archive.library.gatech.edu/fulton_bag/itemd9f9.html?collection=ms004&filename=ms004-112.xml

Elsas, Oscar, 1871-1924. "Letter from Oscar Elsas to Walter Drew, National Erectors' Association." 1915-07-07. July 29, 2025. https://exhibit-archive.library.gatech.edu/fulton_bag/itemd9f9.html?collection=ms004&filename=ms004-112.xml.