id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
inhs-340	Sampson, Homer	An Ecological Survey of the Prairie Vegetation of Illinois	1921	87	.pdf	application/pdf	18561	923	60	Indeed the dynamic and genetic relationship of plant associations was not fully appreciated until Cowles (4) pointed out its significance in 1890. While the origin of this prairie dates back to the changes in climate following the uplift of the Rocky Mountains and subsequent changes during and following the glacial period, the factors limiting its present distribution are to be found in the present climatic and edaphic conditions together with the biotic factors which affect succession from prairie to forest associations.	cache/inhs-340.pdf	txt/inhs-340.txt