Federal Land Patents: Transfers federal land to individuals; gives time & place, especially early settlers of an area
Google: Enter name of place + topographic, search
Sanborn Fire Insurance Maps Now Online – a great source of historical data to genealogists, researchers, etc. Michigan maps pre-1900 are now available from the Library of Congress.
U.S. Historic Maps: Early, settlement, military, parks, memorials, links to other historic sites from map collection at University of Texas