id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-72612	Haapala, Hannu E. S.	Position Dependent Control (PDC) of plant production	1995	133	.pdf	application/pdf	64415	4740	64	Besides these there are local satellite positioning systems, e.g. Starfix that operates in the U.S. continent (Ott 1988). Larsson (1990, 79) thinks that sensor development is crucial for the development of crop production systems.	cache/afs-72612.pdf	txt/afs-72612.txt