[8] J. W. Bagley: The Use of the Panoramic Camera in Topographic Surveying, With Notes on the Application of Photogrammetry to Aerial Surveys, U. S. Geol. Survey Bull. 657, p. 84. “The scale of the photograph is given by the relation f/H, f being the focal length of the lens and H the height of the camera above ground.” (Ibid.)
[9] E. Lester Jones: The Aeroplane in Surveying and Mapping, Flying, June, 1919, pp. 438-441, 472, and 476.
[10] H. E. Ives: Airplane Photography, 1920, pp. 407-408.
[11] E. Lester Jones: Surveying From the Air, Science, Vol. 52, 1920 (Oct. 17), pp. 574-575, and Engineering News-Record, Dec. 16, 1920, pp. 1184-1186.
[12] E. Lester Jones, op. cit. (Science), p. 575.
[13] J. Volmat: Application de la photographie aérienne aux levés hydrographiques, Comptes Rendus de l’Acad. des Sci. [de Paris], Vol. 169, 1919, Oct. 27, pp. 717-718; idem: Rapport sur la mission photohydrographique de Brest (1919), Annales Hydrogr. (publ. by Service Hydrographique de la Marine, Paris), 3rd Series, 1919-20, pp. 191-220, with seven air photographs and corresponding sections from French coast charts.
[14] H. Hamshaw Thomas: Geographical Reconnaissance by Aeroplane Photography, With Special Reference to the Work Done on the Palestine Front, Geogr. Journ., Vol. 55, 1920, pp. 349-376; reference on p. 369.