id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-5791	ÅSTRÖM, M.; SUNDSTRÖM, R.; HOLMBERG, M.	pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century	2005	9	.pdf	application/pdf	6152	370	66	The results show that among several potentially acidifying activities, reclamation of mires for farmland (19th and 20th centuries) and subsurface drainage of acid sulphate soils (post-war times) are the major causes of the pH decline. Export of acidity in drainage water from acid sulphate soils.	cache/afs-5791.pdf	txt/afs-5791.txt