Gadhafi's government controls the skies by day; sundown brings rebels out in oil-rich east

TOBRUK, Libya - Moammar Gadhafi's warplanes, artillery and mortar shells can control huge swaths of territory by day, including oil ports, rebel supply routes and even hostile towns. Rebels say anti-government forces can still return in darkness to take advantage of Gadhafi's own thin supply lines a

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