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Editorial note (de)
yRGKArch08 - GeselKunstMosai; yRGKArch09 - GeselKunstMosai; yRGKArch10 - GeselKunstMosai; yRGKArch11 - GeselKunstMosai; yRGKArch12 - GeselKunstMosai; yRGKArch14 - GeselKunstMosai