From their announcement:
To support the Company B release of the the first 1/56 Gear Krieg Walker the Gear Krieg printware book (Softcover, Full Colour version, 78 pages) is on sale! A.D. Publishing will retail the book for 4 weeks for 15,00 EURO including recorded shipment within Europe. You can order it easily using Paypal from our new Order section.
