Photoelectric UBV observations of 120 stars in the young open cluster Trumpler 37 are presented, primarily in the magnitude range 10.0<V
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Marschall, Laurence A. Photometry of the Young Open Cluster Trumpler 37. The Astronomical Journal. (May 1990) 99(5):1536-1547.
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Original version available from the publisher at: http://iopscience.iop.org/1538-3881