References 
(1) The Art of taking Air Photographs. J. A. Eden. 
Photogrammetric Record April, 19&4» 
(2) Factors Affecting the Interpretability of Air 
Photographs Professor K. B. Jackson. International 
Archives of Photo gramme try. London, I960. 
(3) Brightness of Fine Detail in Air Photography. 
Carman and Carruthers J.O.S.A. May, 1951- 
(4) Reproduction of High Acuity Aerial Photography. 
Berg. Photographic Science and Engineering. 
November-Deeember, 1961. 
(5) Loss of Negative Resolution due to Printing and 
Examination Procedures. J. A. Eden. 
Photogrammetric Record, April, 1963*