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Measurements of biologically effective solar temperate latitudes for the same solar angles. ultraviolet irradiation at Barrow, Alaska (71? These lower intensities might be attributed to 20'N, 156? 46'W), during late July and early high atmospheric ozone concentrations at northAugust 1970, under clear to partly cloudy erly latitudes which effectively attenuate the skies, indicate substantially lower intensities most biologically effective UV wavelengths. than would be expected at low elevations in
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Martyn M. Caldwell (1972) studied this question.
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