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Editorial note (de)
yRGKArch03 - NaturGeolo; yRGKArch04 - NaturGeolo; yRGKArch05 - NaturGeolo; yRGKArch06 - NaturGeolo; yRGKArch07 - NaturGeolo; yRGKArch08 - NaturGeolo; yRGKArch09 - NaturGeolo; yRGKArch10 - NaturGeolo; yRGKArch11 - NaturGeolo; yRGKArch12 - NaturGeolo; yRGKNaturGeowiGeolo