Emergency Response to Terrorism Self-Study, U.S. government document, August of 1997
https://www.ncjrs.gov/pdffiles1/Photocopy/189722NCJRS.pdf
This is a government document from August of 1997, meaning it came out 4-years and 1-month before September 11, 2001. Notice the bullseye on the World Trade Center.
9/11/2001 = 9+11+20+01 = 41