Budd Hopkins' 1987 book, Intruders: The Incredible Visitations at Copley Woods , is a foundational text in ufology that shifted focus to personal abduction experiences and introduced the concept of a genetic hybridization program. The work, documenting the case of "Kathie Davis," solidified the "Grey" alien trope and pioneered the use of regressive hypnosis to recover memories of encounters.
Because Hopkins focuses so tightly on one family, the PDF serves as an excellent primary source for students of paranormal sociology. You see the psychological damage (disassociation, marital strain), the physical traces (scars, scoop marks), and the environmental effects (electrical disturbances). Budd Hopkins Intruders.pdf