id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
inhs-173	Anderson, Harry G.	Food Habits of Migratory Ducks in Illinois	1959	64	.pdf	application/pdf	19776	984	63	Plant material in the gizzards of ring-necked ducks increased from 64.10 per cent of organic contents in 1938 to 75.20 per cent in 1939, paralleling the in- crease in duck food plants in Illinois River valley lakes (Bellrose 1941:249-53). However, this shrub is less undesirable in a waterfowl habitat than lotus or river bulrush, which have lit- tle value as duck food plants.	cache/inhs-173.pdf	txt/inhs-173.txt