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A balloon-borne technique for stratospheric collection of micron-size dust from up to a million cubic meters of air has been developed. The technique samples particles in size range of roughly 1–100 microns, and thus the extraterrestrial particles in this size range that do not burn up during their entry in the earth's atmosphere are collected. The collection made during June 1966 indicates that the total terrestrial accretion of such particles certainly does not exceed 550 tons per day and is probably less than 50 tons per day.
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Arnold et al. (1968) studied this question.
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