The list was issued by the Air Ministry, monthly September 1918-June 1940, in alternate months August 1940-July 1944, and quarterly from October 1944. There was no issue for January 1940, and the present run lacks those for October 1947 and April 1948
Issued half-yearly 1941-1944 and then quarterly, by the Government of India Defence/War Department. The present run lacks the issues for October 1942, April 1943 and April 1944
Each volume contains an index, frequently cumulative from 1918 to date. Between 1931 and 1934 the orders are divided into Section A - Administrative, Section N - Temporary orders and notices, and Section E - Equipment. Only A and N are present from 1935