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EARTH'S OTHER SHADOW
Tight with mild tilt; spine is slightly faded; 2" line/bend-trace at lower left corner of back cover. The biggest problem is a shallow 5" diagonal bend-trace from upper left of front cover to bottom middle (the scan only hints at it.)
No artist credit is given; no signature is visible. isfdb.org attributes to Paul Lehr, and one can make a case for it given the small domes in middle of cover - something Lehr is famous for. But to me, those don't look like the usual Lehr domes, and the planet silhouettes at bottom don't look like what Lehr does (he usuallly has crescents.) The dominant color makes me think of another artist who did covers for Signet in the same timespan - compare to the paperback-first of Poul Anderson's There Will Be Time (same color-palette - but that artist is uncredited...)
After an initial explosion of output in the mid to late fifties (he won a Hugo for "best new author" in 1956) , Silverberg slowed down when the magazine market shrank, and took on other projects including history books for a few years. In the late sixties, he became noticed for a more mature, artistic style, garnering Hugo & Nebula nominations for his 1967 novel Thorns and the magazine version of "Hawksbill Station," and then winning a Hugo for "Nightwings" and a handful of Nebula awards for short works plus the novel A Time of Changes.
Earth's Other Shadow (1973) - a collection of 9 stories by Robert Silverberg. Five of these make their first appearance in a Silverberg collection - although most made it into several collections (Silverberg entered his most artistic and self-improved phase in the mid-Sixties to early Seventies / they tended to appear in retrospectives.) Only "Hidden Talent" is unique to this collection.
Something Wild is Loose
One was from 1957, one from 1963; the rest originally appeared from 1967 to 1971 - in The Many Worlds of SF, World of Tomorrow, Magazine of F&SF (2), Three for Tomorrow, The Farthest Reaches, IF, Cosmopolitan, Dangerous Visions.