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21. Notice to aviators no. 2; Feb. 1, 1940.

22. Notice to aviators no. 3: Mar. 1, 1940.

23. Notice to aviators no. 4; Apr. 1, 1940.

24. Notice to aviators no. 5; May 1, 1940.

25. Notice to aviators no. 6; June 1, 1940.

26. Notice to aviators no. 7; July 1, 1940.

27. Notice to aviators no. 8; Aug. 1, 1940.

28. Notice to aviators no. 9; Sept. 1, 1940.