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153. Notice to aviators 1, 1930; Jan. 1 [1930].

156. Notice to aviators 2, 1930; Feb. 1 [1930.]

157. Notice to aviators 3, 1930; Mar. 1 [1930].

158. Notice to aviators 5, 1930; May 1 [1930].

159. Notice to aviators 6, 1930; June 1 [1930.]

160. Notice to aviators 7, 1930; July 1 [1930]