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The evolution of asteroidal orbits initially near the Kirkwood Gap at the 1:2 commensurability with Jupiter's period provides a mechanism for the production of meteorites from the asteroid belt without excessive velocity change. The resulting yield ( approximately 10(9) grams per year) and the orbital elements of Earth-crossing objects are in agreement with observational data on meteorites.
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Zimmerman et al. (1973) studied this question.
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