American Astronomical Society, Astrophysical Journal, (396), p. 173, 1992
DOI: 10.1086/171707
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A determination of the luminosity and mass functions is given for field stars at the bottom of the main sequence as the first results from a 320 sq deg survey based on both optical and near-infrared photometry. The luminosity and mass functions are determined with an order of magnitude higher precision than previous studies achieve. No evidence is found for a mass function steepening toward the H-burning limit.