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Wool Production, Extension Bulletin #136(Issues 135-184). State College of Washington. April 1926. p. 74. Pyrotol is a mixture of 60% smokeless powder, 34% sodium nitrate and 6% of 40% nitroglycerin dynamite. https://books.google.com/books?id=YSw3AQAAIAAJ&pg=RA4-PA125
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Schechter, Harold (2012). Psycho USA: Famous American Killers You Never Heard Of. Random House Digital, Inc. pp. 277–278. ISBN 978-0-345-52448-5. 978-0-345-52448-5
"Heavy Orders Cut Supply of Pyrtol". Granite Falls Record (Newspaper Archive of Granite Falls Historical Society, Granite Falls, Washington). September 30, 1927. Retrieved December 16, 2012. http://gfp.stparchive.com/Archive/GFP/GFP09301927P01.php
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Seitz, Charles E. (1925). "Project No. 10 – Land Clearing". Virginia Tech. hdl:10919/90121. http://hdl.handle.net/10919/90121