@misc{indiciae903c4c1904b1,
  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 71},
  year = {1938},
  url = {https://www.biodiversitylibrary.org/page/26504585},
  note = {Source identifier: page-26504585}
}