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2by Gray, DavidGet access
Published in Proceedings of the Royal Geographical Society and Monthly Record of Geography (1881)
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3On Discoveries East of Spitzbergen and Approaches Towards the North Pole on the Spitzbergen MeridianGet access
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5by Elkington, T. T., Hofmann, W., Budel, J., Wirthmann, A.Get access
Published in The Journal of Applied Ecology (1970)
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15Published in Proceedings of the Royal Geographical Society and Monthly Record of Geography (1883)Get access
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17by van der Horck, Alexander HumboldtGet access
Published in Journal of the American Geographical Society of New York (1876)
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