I've worked in the medical field for 40 years and have a small collection of old medical ephemera. I love reading the old medical almanacs from the 1920's to 1950's. The almanacs were actually printed by companies in an effort to sell their medicines, and distributed by drugstores and pharmacies. And what medicines they were! My newest creation is a magnet from an advertisement in the 1939 Jaynes's Almanac for vermifuge for roundworms! Basically, the entire booklet educated the reader on the symptoms and horrors of this parasite. I have no idea whether the medicine worked, but found the reading quite amusing. The advertisement is mounted on heavy chipboard, sealed with mod podge, edged in copper foil tape, and has a full magnetic back. It measures 2 1/2" square. I had a lot of fun with this; I think I'll be doing some more in the near future.