Anderson Poul. Delenda Est

The hunting is good in Europe twenty thousand years ago, and the winter sports are unexcelled anywhen. So the Time Patrol, always solicitous for its highly trained personnel, maintains a lodge in the Pleistocene Pyrenees.
Manse Everard stood on a glassed-in verandah and looked across ice-blue distances toward the northern slopes where the mountains fell off into woodland, marsh, and tundra. His big body was clad in loose green trousers and tunic of twenty-third-century insulsynth, boots handmade by a nineteenth-century French-Canadian; he smoked a foul old briar of indeterminate origin. There was a vague restlessness about him, and he ignored the noise from within, where half a dozen agents were drinking and talking and playing the piano.
A Cro-Magnon guide went by across the snow-covered yard, a tall handsome fellow dressed rather like an Eskimo (why had romance never credited paleolithic man with enough sense to wear jacket, pants, and footgear in a glacial period?), his face painted, one of the steel knives which had hired him at his belt. The Patrol could act quite freely, this far back in time; there was no danger of upsetting the past, for the metal would rust away and the strangers be forgotten in a few centuries...