@book {TN_libero_mab2,
author = { Everling, Emil },
title = { Um die Freiheit Deutscher Luftfahrt },
publisher = {Sponholtz},
keywords = { Deutschland , Luftverkehrspolitik , Treaty of Versailles (1919 June 28) },
year = {1926},
address = { Hannover },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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