Serg did publish at least 3 books around between 1970-1975. I didn't know much about this company. It seems that there are more prints for some of the volumes. No titles on the covers. B&W books. Book one is printed in 1973, and consists of plate 1-181. Very rare, expensive books.

Book 1 Euro 75

Book 2 Euro 75

Book 3 Euro 75