Purchased a 1983 ACTION Bus Fleets book published by Railmac on eBay for 0.99 GBP (about $1.70), has some interesting photos of ZIB-512, ZIB-378, ZIB-208, ZIB-296, ZIB-269, ZIB-261, ZIB-510 and even the AEC Regal (which was undergoing restoration at the time).
Anyone also have a copy?