@misc{E._M._Zoppoter_[ca,
 author={E., M.},
 title={Zoppoter Waldoper. Richard Wagner Festspiele},
 address={Danzig [Gdańsk]},
 year={[ca 1930]},
 language={ger},
 type={pocztówka},
 publisher={A. W. Kafemann},
 keywords={Karty pocztowe -- 1900-1945},
}