Hi Evan,
The second English book sliver in color focuses on Ko-Tōsho, Ko-Kachūshi, Shoami, Akasaka, Kyo-Sukashi, Owari, Kanayama, Yagyu, Hirata, Miyamoto Musashi, Shimizu, Hayashi, and Nishigaki schools. I might have missed or added one from the first book as I am at work and don't have the book in fount of me as I am typing on my iPhone. Here is more information about the book: http://www.japaneseswordbooksandtsuba.com/store/books/b671-sasano-Japanese-sword-guards-masterpieces-sasano-collection.
P.S. Just updated with the full lists of schools in this book. At 342 pages it is a wonderful reference for sukashi tsuba.