@misc{indiciae0ee0632c924a,
  title = {Codes for cloud forms and states of the sky according to the international system of classification. Prepared by the Weather bureau Committee on clouds and cloud forms — Illustration, Page 61},
  year = {1938},
  url = {https://www.biodiversitylibrary.org/page/26504575},
  note = {Source identifier: page-26504575}
}