The records of Rock County begin; the first meeting of the county commissioners was held.

The evidence

• “The records of Rock county begin April 1, 1839. Rock county was organized in 1839. The first commissioners were Enos I.”

  1908-brown-rock-county/09-county-government.md, Vol. 1, PDF p. 255 / book p. 233

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources

• “Murray and William Spaulding. Their first meeting was held on the 1st day of April, 1839, with W. H.”

  1879-history-of-rock-county/10-rock-county-ch04-early-maps-courts-railroads.md, PDF p. 362 / book p. 366

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources