Grenzgebiet Konstanz; Umrissradierung, koloriert
<bdi><a href="https://en.wikipedia.org/wiki/en:Matthias_Pfenninger" class="extiw" title="w:en:Matthias Pfenninger"><span title="Swiss artist">Matthias Pfenninger</span></a>
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<a rel="nofollow" class="external text" href="http://www.helveticarchives.ch/detail.aspx?ID=480635">helveticarchives.ch</a>; Swiss National Library, Prints and Drawings Department