Among his most strongly held (and extensively documented) theories was the notion that a race of malevolent Yeti have been interbreeding with humans since time out of mind, and that the hybrid offspring are bringing about the end of civilization. As proof of this, he pointed to the Russians.
February 7, 2014
As C. van Carter pointed out to me, Jim Woodring wrote in his profile of the eccentric Polish sculptor, The Neglected Genius of Stanislaw Szukalski:
By Steve Sailer on 2/07/2014