What we know about this document

    Although it gained notoriety through radio host
    Milton William Cooper's 1991 book Behold a Pale Horse,
    credit for its compilation is attributed to 
    Lyle Hartford Van Dyke Jr., who emerged years later
    claiming to be the principal author of it. 

    In a letter dated December 2003 to Paranoia Magazine,
    Van Dyke wrote that he had compiled the manual around
    October 1978, sent out about 65 initial copies to
    personal contacts, and that one copy he gave to a
    hitchhiking military individual at McChord AFB 
    ended up in the copier's surplus sale.

https://en.wikipedia.org/wiki/Silent_Weapons_for_Quiet_Wars_...