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![Plate 21-24 of 1921 cloud chart wea02330.jpg Plate 21-24 of 1921 cloud chart](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_wea02330.jpg?itok=ZtMq2T7Y)
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Plate 21-24 of 1921 cloud chart. 21. Strato-cumulus or alto-stratus sheet,slightly mammulated.... 22. Strato-cumulus, evaporating scaly type.... 23.Cumulus and strato-cumulus below, thin alto-stratus above. 24. Lenticularalto-stratus. Uper, standing clouds topping S wind; lower left, standing cloudin lee of Mt. Washington during NW gale; lower right, conditions unknown. (Image credit: NOAA Central Library Historical Collections)