Hey KivaJoe,
Most of the illustrations are available (or were) in the uniform collection at the NYDPL.
His Napoleonic books have been reprinted about 5 times. The earlier volumes come up from time to time in used book stores in Poland.
The books are by Jan Czop and entitled:
vol. I: Barwa Rzeczpospolitej Obojga Narodow w XVIII Wieku, this is the one that covers the Lithuanian and Polish regiments in the 1700s
vol. II: Barwa Armii Krolestwa Polskiego, 1815-1830 i 1831
He also wrote a book entitled: Barwa Armii Krolestwa Polskiego 1815-1830 oraz w Wojnie Polsko-Rosyskiej 1831. I don't have this one, though it's available. I think it's a reworking of the above vol. II but with additional info on the new regiments raised during the Russo-Polish War of 1830-1831.
Actually, I'm planning to do a Grand Duchy of Lithuania army from the 1770s in 15mm after I finish off the Trojan War project.
Hope this helps!