A History of Short Words

From the New York Times Crossword Puzzle

URAL

Mon, 17 Jan '22
Russian river
Fri, 7 Jan '22
___ Mountains, range crossed on the Trans-Siberian railway
Tue, 21 Dec '21
Russia's ___ Mountains
Sat, 13 Nov '21
River that's a letter off from 20-Across
Wed, 7 Apr '21
___ Mountains, dividers of Europe and Asia
Tue, 5 Jan '21
Name of a mountain range or a river