(See Cover)
Along the steaming, mud-covered delta of Africa's Niger River, bare-chested men labored amid crocodiles and screaming parrots this week to push shafts of steel deep into the earth. On the choppy waters of the Persian Gulf, others perched on a crablike platform and sent a snag-toothed bit boring into the ocean bed. Around the world, hundreds of men labored just as sweatily in 35 other countries from the pampas of Argentina to the back hills of New Zealand to probe the earth in an eager quest for the substance...
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