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![Plate 5-8 of 1921 cloud chart wea02326.jpg Plate 5-8 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_wea02326.jpg?itok=mvX-FTus)
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Plate 5-8 of 1921 cloud chart. 5. Cirrus (top half of picture) and cirro-stratus (bottom half). 6. Cirrus merging into cirro-stratus: not infrequentlya sky aspect subsequent to (2) or (4). 7. Cirro-stratus and alto-stratus, with cirro-cumulus and alto-cumulus tops... 8. Cirrus (the detached portions) andcirro-stratus, from evaporation of such clouds as (7). (Image credit: NOAA Central Library Historical Collections)