A coworker of mine was kind enough to think of me when she was getting rid of some old stuff, and gave me a couple dozen of old crochet and general craft books. They date back to the 1970s. I can't express how much I love looking through old pattern books - especially from the 60s and 70s, when there seemed to be a lull in popularity of hand knitting and crocheting.
As expected, some of the patterns are a gaudy riot (case in point, see the upper right-hand gal in the fur hat) but there are a ton of patterns that are actually still charming! I especially love the Workbasket pamphlets; these have crochet and knitting patterns in addition to recipes and household tips 'n tricks. It's interesting to see what has changed over the years, versus what hasn't. Clearly advertisements for diet pills have been around a while.
The same coworker also gave me Knit Step by Step and The Knitter's Handy Book of Top-Down Sweaters. A different coworker gave me a copy of Synthetic Dyes for Natural Fibers - I don't do much spinning or dyeing, but I'd love to get into it! Maybe once I'm out of school.