Percy Douglas (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Percy Douglas" in English language version.

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Douglas, H.P. (1929). "Echo Sounding". The Geographical Journal. 74 (1): 47–55. Bibcode:1929GeogJ..74...47D. doi:10.2307/1784944. JSTOR 1784944.

Douglas, H.P. (1929). "Echo Sounding". The Geographical Journal. 74 (1): 47–55. Bibcode:1929GeogJ..74...47D. doi:10.2307/1784944. JSTOR 1784944.

Douglas, H.P. (1929). "Echo Sounding". The Geographical Journal. 74 (1): 47–55. Bibcode:1929GeogJ..74...47D. doi:10.2307/1784944. JSTOR 1784944.

"The Nicaragua Trouble – Letter from a young Queenslander". The Brisbane Courier. Queensland: National Library of Australia. 28 August 1894. p. 6. Retrieved 28 February 2015.