@misc{indiciae50494ae7154b,
  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 57},
  year = {1938},
  url = {https://www.biodiversitylibrary.org/page/26504571},
  note = {Source identifier: page-26504571}
}