Vladimir Firsov - Star Elixir (USSR, 1987)

artist: Garif Basyrov

Anatoly Dneprov - Immortality Formula (front and rear cover) (USSR, 1963)

artist: Nikolay Grishin

Adventure World 1965 anthology (endpaper) (USSR, 1965)

artist: Yuri Kopeyko

Stars of American Science Fiction anthology (USSR, 1991)

artist: Alexander Medvedev

Only One Start anthology (USSR, 1971)

artist: Aleksey Tertysh

Hal Clement - Mission of Gravity (Foreign Science Fiction series, USSR, 1991)

artist: Kira Soshinskaya

Mikhail Yemtsev & Yeremey Parnov - Fall of the Supernova (USSR, 1964)

artist: Ülo Sooster

American Science Fiction Short Stories anthology (USSR, 1960)

artist: Vladimir Medvedev

Boris Zelensky - Nymph of the Foundry (Erotic Science Fiction) (USSR, 1990)

artist: V. Shibaev

Ilya Varshavsky - The Man Who Saw the Antiworld (USSR, 1965)

artist: Yuri Makarov

Alexander Mirer - I Have Nine Lives (USSR, 1990)

artist: Sergey Krasulevsky

Petar Bobev - The Loner of the Ice Desert (Bulgaria, 1963)

artist: Dimitar Popvasilev

Ilya Varshavsky - No Alarming Symptoms (Galaktika library series, Bulgaria, 1980)

artist: Tekla Aleksieva

Moj Mikro magazine (SR Slovenia, Yugoslavia, 1985)

artist: Zlatko Drcar

J.R.R.Tolkien - The Hobbit (USSR, 1991)

artist: Nataliya Fadeyeva

I know it's tough to find the info with ephemera and stuff but would you be able to credit the artists for the book covers? I think they're really cool but it makes me kinda sad that we only have author names and not artist names!

Noted, I have updated the posts with the artist names where available

Alpha Eridani anthology (USSR, 1960)

artist: Vladimir Noskov