A couple of weeks ago, I bought a book from a charity shop. The title is 'Discovering Rewarding Photography - The Manual of Russian Equipment' and it is written by Ron Spillman.
Produced in 1971, it is a combination of photography tips and a catalogue of a company called Technical and Optical Equipment (London) Ltd.
Technical and Optical were the UK importer of Zenith cameras and accessories along with products from Fed, Zorki and Kiev.
I was going to give this book away anyway so if it is of any use to you, send me a message with your address and I will post it to you.