United States. Meteorology,
United States. Signal Office. *Cab.39.31.4 Charts showing the average monthly cloudiness in the United States. [Washington. 1&91.] (2) pp. (12) charts, each 47% X 60 cm., folded once and mounted in covers. “The data have been drawn from eighteen years’ tri-daily eye observa- tions, 1871-1888.”
 
This card was printed at the Boston Public Library, April 14, 1914.
K1917 — United States. Meteor. — Clouds.