A small population may have survived into the late 19th century, according to Ivan T. Sanderson, writer of a book (published back in the 60's or early 70's, I think) Abominable Snowmen: Legend Come to Life.
It details stories of the capture of a "wild woman" in a frontier area somewhere around the Ural Mountains, that she was kept and "used", giving birth to halfbreed offspring which did not survive when she took them down to the icy creek to wash them after birth.
Sanderson has a ton of stories of human-like creatures; credible or not, the book is an interesting read. I think I'll check it out a my library again, it's been at least ten years since I've seen it.
Thanks for the tip! I'll read that book. The only sci fi I enjoy is the kind that claims it isn't.
Please nobody pile on me because I can't stand normal sci fi. It's genetic and I can't help it.