| 
Citations
 | 
   web
Hough, W. (1901). The development of illumination. American Anthropologist, 3(2), 342–352.
toggle visibility
Downey, J. W. (1919). Determination of minimum light sense and retinal dark adaptation with presentation of a new type of photometer. American Journal of Ophthalmology, 2(1), 13–20.
toggle visibility
Rawson, H. E. (1932). A bird's song in relation to light. Transactions of the Hertfordshire Natural History Society Field Club, 17, 363–365.
toggle visibility
Cottam, C. (1929). A shower of grebes. The Condor, 31(1), 80–81.
toggle visibility
Squires, W. A., & Hanson, H. E. (1918). The destruction of birds at the lighthouses on the coast of California. The Condor, 20(1), 6–10.
toggle visibility