Besides the Filet discovery, I also came across these gems. One thing I absolutely love about vintage pattern books are the marks left by their former owners. (Actually, that's one of the things I love about used cookbooks, too). Take Collingbourne's, for example. Apparently, someone didn't care so much for the artistic crochet contained within these pages, as she (I presume) glued other patterns straight over them! Virtually every page has been rethought with an "improved" pattern glued over the inferior one.
Another favorite, and among the books that compelled this hooker to bloody learn to knit, are these copies of Leach's. Take a look. Do I really have to explain? I mean, that cape is faaaaaaabulous!