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  Author (up) Title Year Publication Volume Pages Links
Burger, J.W. Some aspects of the roles of light intensity and the daily length of exposure to light in the sexual photoperiodic activation of the male starling 1939 Journal of Experimental Zoology 81 333-341 details   doi
Gartlein, C.W. Request for Auroral Observations 1939 Journal of the Royal Astronomical Society of Canada 33 46-50 details   url
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