From Heraldry of the World
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Civic heraldry of Germany - Deutsche Wappen (Gemeindewappen/Kreiswappen)
The arms were granted on July 8, 1957.
The eagle is taken as a symbol for the Dukes of Schwaben. The three heads symbolise the three former territories that were transformed into the district. The colours are also the colours of Württemberg.
Literature : Stadler, K. : Deutsche Wappen - Bundesrepublik Deutschland. Angelsachsen Verlag, 1964-1971, 8 volumes.