From Heraldry of the World
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Civic heraldry of Germany - Deutsche Wappen (Gemeindewappen/Kreiswappen)
The arms were granted on October 1, 1974.
The arms are a combination of elements from the two older arms. The chief with the arms of Bayern is taken from both older arms. The lion is taken from Landau, the bars from Dingolfing.
Literature : Stadler, K. : Deutsche Wappen - Bundesrepublik Deutschland. Angelsachsen Verlag, 1964-1971, 8 volumes.