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An Extemporized Railway Drawbridge, Oxonized Air, The Philippine Bureau of Forestry

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Scientific American Magazine Vol 110 Issue 4This article was originally published with the title “An Extemporized Railway Drawbridge, Oxonized Air, The Philippine Bureau of Forestry” in Scientific American Magazine Vol. 110 No. 4 (), p. 87
doi:10.1038/scientificamerican01241914-87a