No. 9 of the year 1939 The Notices to Aircraft Owners and Ground Engineers issued during the years 1920–1938 and remaining in force on 18th February, 1939, have been reprinted in booklet form, with all amendments promulgated prior to that date, together with additional amendments in certain cases, incorporated in the Notices concerned. A subject index is included.
(1939), "Air Ministry Official Notices: Instructions for Ground Engineers on Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 7, pp. 295-295. https://doi.org/10.1108/eb030520
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