CRATERS (O)
Olbers [7.4oN, 75.9oW] Omar Khayyam [58.0oN, 102.1oW] Opelt [16.3oS, 17.5oW]
Oppolzer [1.5oS, 0.5oW] Orontius [40.3oS, 4.0oW]
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