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Photographic coverage of about 80,000 deg2 of sky with the Palomar 46-cm Schmidt camera has yielded 12 new planet-crossing asteroids as well as many objects in the main asteroid belt. The estimated population of planet-crossing asteroids includes ???100 Atens, 700 ?? 300 Apollos, 1000-2000 Amors, 10,000 ?? 5000 Mars crossers, and ???5000 Mars grazers. ?? 1979.
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The Palomar planet-crossing asteroid survey, 1973-1978