Plate 9-13 of 1921 cloud chart. 9. Cirro-cumulus, overhead. 10. Cirro-
cumulus, with tufted cirrus. 11. Thin, undulated alto-straus forming above a
layer of fog or stratus... 12. Thin alto-stratus (lower right) transforming to
growing alto-cumulus, which becomes merged into dense alto-stratus...."
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