Similarly, a duty levied on exports is called an export duty.
A tariff, which is actually a list of commodities along with the leviable rate (amount) of customs duty, is popularly referred to as a customs duty.
Nowadays, there are a bunch of books with a similar title, adapted to newer times.
Much of what is described in the Knigge doesn't necessarily apply to everyone, especially when dealing with younger people, the rules are far more relaxed.
August is the busiest time for tourism, as it falls in the main school holiday of the year, the summer holidays, which lasts for six weeks for state run schools. The festival of Lammas marks the beginning of the harvest, when people go to church to give thanks for the first corn to be cut.