id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-72345	Ryynänen, Viljo	Research on the agricultural economics in the 1970s and 1980s	1989	8	.pdf	application/pdf	4618	432	58	Consequently, giving a systematic picture of agricultural economic research is highly de- pendent on the choice of taxonomy and terms. Pioneering work in this field was made by Sumelius (1987) in his doctoral dis- sertation, in which he concluded that the resources invested in agricultural research and extension services have yielded a fair- ly high percentage of returns, significantly higher than the percentage of returns that could be given by the resources invested in the production itself.	cache/afs-72345.pdf	txt/afs-72345.txt