All,
The Leopard 1 Family of Vehicles, which I co-authored with Michael Shackleton in the UK, covers the entire range of Leopard 1 MBT variants and derivatives used around the world. Due for release by Haynes publishing in March 2020. Pre-publication orders are now being taken by various booksellers:
https://www.google.com/search?q=Leop...=1725&bih=1321
... and including Amazon:
https://www.amazon.co.uk/Leopard-Mai...=books&sr=1-14
Enjoy!
Mike