Multi-volume work

World Meteorological Organization, 1975-1987. International Cloud Atlas. Geneva, Switzerland: 2 vols..

Volumes

1. World Meteorological Organization, 1975. Volume I. Manual on the Observation of Clouds and Other Meteors, Revised edition: [I]-XXIII, [1]-155.
2. World Meteorological Organization, 1987. Volume II: [1]-212.