Tight and square - probably unread. Slight overall wear. No stamps, marks or writing. I'm not all that impressed with the paper quality: age tanning is mild to moderate and uniform. (Many paperbacks from the Seventies had low-grade paper, so I'm not sure you can do better.) A printing-glitch has the art & printing on the front cover placed high - so that the price (normally at top) has been trimmed off.

1977 translation by Helen Saltz Jacobson of Obitaemyi ostrov (1971 - Russian.) This features Maxim Kammerer, who also appears in Beetle in the Anthill (1980-AM) and The Time Wanderers (1987-AM.) The Maxim Kammerer books are part of a larger "Noon Universe" series. The prices I found online for this (in paperback) are amazingly high - but I'd rather sell this for someone to read.