Ganson, Lewis: Mini-Slate Magic © Supreme Magic, Bideford, England Softcover, saddle-stitched, 8x10", 28 pages

Image courtesy eBay seller MHMagicMagazines

Comments: From the cover, "Top routines with miniature slates by Peter Warlock, George Blake, and Edwin Hooper" (of Supreme Magic).

Contents (courtesy Lybrary.com, numbers are not page numbers):

1 Introduction
2 Phantom Prediction
3 Shuffled Forecast
4 Sum Total
5 Spirit Message
6 Spirit Message Again
7 Duplication
8 Mini-Transpo
9 Two Messages
10 Two Messages On One Slate
11 Numbered Slates
12 Any Colour With White Chalk