The new edition (2021, 7th Edition) of the Kangaroos Australian Commonwealth Specialists Catalogue (ACSC) is now available here:https://www.fairdinkumstamps.com/BW...roos2021.htm
"This new edition updates the previous 2017 edition, and is in the new full colour A4 format. The Kangaroos listings have been fully revised with corrections and additions, including a number of new listings added to the pre-1913 essays, and many additional illustrations. Two cover prices are now provided, for solo usages and for other uses of each stamp. All prices have been adjusted to accord with the current market."