What keeps this from five-stars is that I have not seen any other book as comprehensive as this one.The history portion seems exhaustive, and I began to keel over with the descriptions of what happens when you marble (the paints form a 'lip' with the carragheenan to prevent them from blending together), but the color plates are worth the price of the book alone.
There are facsimiles of old German marbling swatch books (which I'd love to get a copy of).
This book is for those who love marbled paper (and fabrics) and who want to know about the history. Might not be the best First Book on marbling, but the process is best learned in a classroom setting, IMHO.