Report of proceedings of the fourth meeting of the International Commission for Weather Telegraphy, held at the Air Ministry, London, September 8th-10th, 1921.
International Meteorological Committee.International Commission for Weather Telegraphy (1921 :London, England)
Great Britain.Meteorological Office,issuing body.
Great Britain.His Majesty's Stationery Office.
Appendix VI of the Report of the eleventh ordinary meeting of the International Meteorological Committee.