Clipping of a letter written to the NMRA Bulletin by a man named Rick Perry regarding the use of fiberglass as insulation. He was part of the crew who swapped out the fiberglass insulation with asbestos, and wrote to dispute a previous letter to the bulletin about using fiberglass insulation. Written below the clipping is "- NMRA Bulletin Jan 1979."
[NMRA Bulletin Letter Response],
accessed March 5, 2020),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting The Grace Museum.