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wwi, ww1, worldwarone, great, 19141918, world, war, one, haig, douglas, sir, general, scotland, national, library, nls, nationallibraryofscotland, balloon, observation, airship, zeppelin, british, reconnaissance, nls:dodid=74548640, nls:derivative=74407177, nls:dodprojectid=74462370, nls:source=solrxml, organization:library=nationallibraryofscotland, owner:name=nationallibraryofscotland, thegreatwar, firstworldwar, worldwari, aviation, lighterthanair, observationballoon, greatwar, britisharmy
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