Erhard, Johann Christoph At the high fortress in Salzburg. Etching. 12.5 x 17.4 cm. 1819. Andresen 1.4, Apell 6 II, Norbert Suhr, in: Under Glass and Frame. Prints of the Romantic period from the holdings of the Landesmuseum Mainz and from private collections. Mainz 1993, p. 57, no. 19.

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