I'm a little late to the party but here are my few...
"Baseball & Tobacco" A guide to collecting early baseball related cigarette and tobacco packs (First and Second Editions, self-published) (most of the information is now contained on
www.baseballandtobacco.com)
"T206 Brands: The 16 Backs and How They Were Packed" - Old Cardboard Issue #3
"1887 N184 Kimball Champions: 19th Century Athletes & Artwork" - Old Cardboard Issue #13