In 1904, the Canadian Bank of Commerce transferred teller Robert W. Service to the Yukon Territory. Soon, he was famous as the poet who chronicled the Klondike gold rush and the savage beauty of the frozen north. His tales of hard-bitten propectors and sourdoughs in "The Land God Forgot" make vivid, exciting reading. Here are all the brawling, colorful characters that Service immortalized, including One-Eyed Mike, Dangerous Dan McGrew, Pious Pete, Blasphemous Bill -- and, of course, the lady known as Lou.  (ALA285, $12.95)