Ace (G-669) [1st printing] 1967 paperback. Cover and frontispiece by Gray Morrow, 157 pages, 50 cent cover price. Condition is VG+ to near-Fine: tight and square with flat spine; faint line next to spine; age tanning is mild and uniform (darker on insides of covers); light overall wear as faint rubbing. No stamps, marks or writing - a clean copy.

Her first collection - these are loosely connected in a chronology of the settlement of Mars by Terrans (newcomers to a dying world with its own long history.) These are the kind of space-opera or planetary-romances that she is best known for. (From inside blurb / summarized from the beginning of "The Last Days of Shandakor"):
Barrakesh is the gateway between north and south on Mars. Long ago, when Valkis and Jekkara were seats of empire and not thieves' dens, Barrakesh had been the meeting place for the rich caravans traveling all of Mars. It is a city of countless years and countless strangers. Now Mars is a dying planet, dried up and hostile, but Barrakesh is still the meeting place - for the Keshi hillmen; the nomads of Shun; tomb-robbers from the south; men and not-quite men from the Low Canals' deserted and silent towns; cosmopolitan sophisticates from Kahora and the Trade Cities. Everyone is free to come and go in Barrakesh - everyone but the Terrans, for even a dying planet will kill to protect its secrets and what treasure it has left.

The Beast-Jewel of Mars
Mars Minus Bisha
The Last Days of Shandakor
Purple Priestess of the Mad Moon
The Road to Sinharat

These originally appeared in Planet Stories, Startling Stories, Magazine of F&SF and Amazing - from 1942 to 1964.