Bonjour, mon ami, Paskai. The name of the book is "Polish Banners at Grunwald", Vol. 1, by Andrzej Klein, Nicholas Sekunda and Konrad A. Czernielewski; Published by Alexander (this edition exclusively for Montvert Oublications; ISBN: 83-912334-0-5; Copyright 2000.
This volume deals with banners for 51 different Polish "clans" and their allies (including Tartars) present at the battle. Vol. II is to cover the Tutonic Orders there and their allies. The book lists many pages of historic works from which the materials presented came from and is really authoritave in appearance!
The book contains over 100 colored examples includining many of the mounted bearers in historically researched illustrations. I paid $29.95 USD in 2000 USD. It is 127 pages in a format reminisant of an Osbry Campaign book. The layout has one side of a page in Polish and in english on the right. This is was obviously a labor of love as the descriptions and narritive goes into great detail.
While it may not provide all the units at the battle, all the units standards, banners and flags depicted are directly related to units that were there, for the Polish and allied side.
I have several other polish books that covers the medieval period(s); a lot on the ottoman empir and middle east in this time period. I do NOT read Polish but the illustrations of uniforms, weapons, fortifications and graphic representation of period formations are well worth their price. Those are in hardback and no, I do not want to sell mine! />)
I hope this helps a bit and that you can still find one at a reasonable price. I never saw the second volume with regards to the Tutonic Orders there.
v/r
Tom Dye