Zine, flyer, fold-up, pamphlet, I prefer Booklet – a very thin book with a few pages with and a paper cover, about (possibly) something interesting. The Sumerians made the first booklets, made on clay tablets in 3,400 BC. But they didn’t have a postal service, or Mail Art.
Nonlocal started making booklets in 1981 – all one-offs sent to mail artists. He’s back at it using better printing and binding technologies, opening the Crevicist Press in 2023. PDF downloads are available on the Crevicist Press page, as well as how to request a booklet.
Nonlocal Variable Mail Art 