Excerpts of the following resources are available.

 Nautical Almanac For 1937

 Aircraft Navigation Manual, H.O. 216 (1941)

 Air Navigation, H.O. 216 (1967)

 American Practical Navigator (1962)

 Air Navigation, TM 1-205 (1940)

 Celestial Air Navigation, TM 1-206 (1941)

 Air Navigation, AFM 51-40 (1951)

 Air Navigation, AFM 51-40 (1973)

 Air Navigation, Weems (1938)

 The American Flight Navigator, Dohm (1958)

 American Air Navigator, Mattingly (1944)

 Precision Astrolabe, Rogers (1971)

 Most Probable Position, Wright (1972)

 Charts