Atlas international des nuages = International cloud-atlas = Internationaler wolken-atlas
"In 1874, the year of the first International Meteorological Congress...important new efforts were initiated in the [field of cloud classification]. During the succeeding 20 years constructive proposals were advanced in many countries by a large number of workers whose combined efforts led in 1896 to publication of the International Cloud-Atlas". This atlas documents an early cooperative scientific investigation on an international level. U.S. observations were made at Blue Hill Observatory, south of Boston.