Книги автора «Emil J. Widmer»

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Military Observation Balloons (Captive and Free) - A Complete Treatise on their Manufacture, Equipment, Inspection, and Handling, with Special Instructions for the Training of a Field Balloon

Military Observation Balloons (Captive and Free) - A Complete Treatise on their Manufacture, Equipment, Inspection, and Handling, with Special Instructions for the Training of a Field Balloon (Emil J. Widmer)