Edmund Flagg, Flagg's The Far West, 1836-1837…
“ Tracing along the bold façade of cliffs on the opposite shore, enveloped in their misty mantle of azure, the eye detects the embouchure of the Illinois and of several smaller streams by the deep-cut openings. To the left extends the prairie for seventy miles, with an average breadth of five from the river, along which, for most of the distance, it stretches. Here and there in the smooth surface stands out a solitary sycamore of enormous size, heaving aloft its gigantic limbs like a monarch of the scene. ”
