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World Weather Records 1921-1930 by H. Helm Clayton World Weather Records 1921 1930 by H. Helm Clayton Observations Made at the Blue Hill Meteorological Observatory... by H. Helm Clayton Annals Of The Astronomical Observatory Of Harvard College V43 by H. Helm Clayton Annals of the Astronomical Observatory of Harvard College 1901 by H. Helm Clayton Annals of the Astronomical Observatory of Harvard College 190... by H. Helm Clayton EFFECT OF SHORT PERIOD VARIATIONS OF SOLAR RADIATION ON THE E... by H. Helm Clayton Observations Made at the Blue Hill Meteorological Observatory... by H. Helm Clayton Discussion of the cloud observations, by H. Helm Clayton Observations Made at the Blue Hill Meteorological Observatory... by H. Helm Clayton


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