Statitics of the inland navigation in Germany, 1835-1989

The study´s content: The study is the second one in a series of manuals on historical statistical data of traffic in Germany since 1835. It is based on work that had been taken...本研究内容：本研究为1835年以来德国交通历史统计数据系列手册中的第二份，其基于已开展的相关工作……