id	keyword
abc-1800	groups
abc-1800	species
abc-1800	diatom
abc-1800	som
abc-1800	water
abc-1800	variables
abc-1800	streams
abc-1800	kützing
abc-1800	lange
abc-1800	types
abc-1800	carbonate
abc-1800	grunow
abc-1800	analysis
abc-1800	bertalot
abc-1800	assemblages
abc-1800	quality