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In 1892, the observatory of Columbia University began the publication of its series of Contributions ... the memoir was numbered 3 in the series, because it was thought best to reserve the first two number for two other publications. In 1892, the observatory of Columbia University began the publication of its series of Contributions ... the memoir was numbered 3 in the series, because it was thought best to reserve the first two number for two other publications.
Portfolio of 8 charts accompanies v. 83.