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Grouping columns

untested because I don't have access to your data, but this should work. 

b13.NEW <- b13[, c("Gesamt", "Wasser", "Boden", "Luft", "Abwasser",
"Gef?hrliche Abf?lle", "nicht gef?hrliche Abf?lle")]
Geophagus wrote:
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