Maps can be a valuable research tool for local history and genealogy. There are many incredible collections of maps that have been digitized and placed online with free access.
Clark County Assessor - The Clark County assessor's office is responsible for listing, discovering and valuing all property in the county every 4 years (by law). With township assessors and county staff, your assessment department monitors building permits, new subdivisions, land transfers, maintains records of ownership and tax liability and a multitude of other corresponding functions to accurately establish valuation of county properties. Farm Land and farm buildings are assessed at their contributory value. Their site includes links to property tax records search and a GIS map of the county.