The Air Almanac: Discussion on the New Form of Nautical Allowance for Rapid Position Finding MacKworth, P. H. ; van Balkom, Commander ; Everitt, P. F. ; Sadler, D. H. ; May, Squadron-Leader ; Bennett, D. C. T. ; Hinks, A. R. ; Black, Archibald ; Barnes, Squadron-Leader ; Comrie, L. J. Abstract Publication: The Geographical Journal Pub Date: August 1938 DOI: 10.2307/1788749 Bibcode: 1938GeogJ..92..133M