of great extent

References in classic literature ?
Being convinced, therefore, from these, and other circumstances, that his people were encamped in the neighborhood of a tribe as honest as they were valiant, and satisfied that they would pass their winter unmolested, Captain Bonneville prepared for a reconnoitring expedition of great extent and peril.
Thus, with difficulties augmenting at every step, they urged their toilsome way among the hills, half famished and faint at heart, when they came to where a fair valley spread out before them, of great extent and several leagues in width, with a beautiful stream meandering through it.