1883 History of Union County
http://contentdm.lib.byu.edu/cdm4/document.php?CISOROOT=/FH26&CISOPTR=16610&REC=3

American Heritage Magazine
http://www.americanheritage.com/

Best of History Websites
http://www.besthistorysites.net/

Bureau of Land Management Records
http://www.glorecords.blm.gov

Castle Garden Immigrant Records
http://www.castlegarden.org

Cyndi’s List of Genealogy Sites on the Internet
http://www.cyndislist.com

David Rumsey Map Collection
http://www.davidrumsey.com/

Digitized Records from Family Search
http://labs.familysearch.org

Family Search (The Church of Jesus Christ of Latter Day Saints)
http://www.familysearch.org/

Genealogy and Local History in Union County
http://union.ohiogenealogy.info

Genealogy.com
http://www.genealogy.com/

Heritage Quest Online
The largest genealogical data, products, supplies and equipment provider to consumers and institutions in the United States.(Library Card Required for Access)
http://www.oplin.org/heritagequest

History Channel
http://www.history.com

Marysville Historical Tour Google Map
/about/news.php?id=504

National Archives and Records Administration Genealogy Resources
http://www.archives.gov/research_room/genealogy/

Ohio Memory
http://www.ohiomemory.org

PhotoOhio
http://www.photohio.org/

Rootsweb
http://www.rootsweb.ancestry.com

Union County Genealogy Society
http://www.rootsweb.ancestry.com/~ohuniogs/

US Census
http://www.census.gov