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42. Observations of Time Variation in the Sun's Rotation. Woodard MF; Libbrecht KG Science; 1993 Jun; 260(5115):1778-81. PubMed ID: 17793654 [TBL] [Abstract][Full Text] [Related]
43. The Solar Flare Recorder of the Sacramento Peak Station of the Harvard College Observatory. Evans JW Science; 1951 Nov; 114(2969):539-44. PubMed ID: 17838051 [No Abstract] [Full Text] [Related]