I’ve recently discovered Etsy as a source for old books and bookish ephemera. A search for “altered books” in the vintage category is like entering an ecommerce-enabled version of BibliOdyssey (i.e., awesome). Some picks:

Word and Image: Posters from the Collection of the Museum of Modern Art (1968)

Book of folklore, 1935

And not bookish but geeky: a 1976 science project kit from Radio Shack. This morass of knobs, switches and nodes can be used to create 150 different things, from a “light-controlled electronic harp” to a “one-way telephone,” “sleep inducer” or lie detector. I’ll probably have already bought this by the time you read this.