A quick history of Lexington, KY (PDF)
University of Kentucky Special Collections - http://libraries.uky.edu/lib.php?lib_id=13
Transylvania University Special Collections - www.transy.edu/academics/library/collections.htm
Lexington Public Library Kentucky Room - http://www.lexpublib.org/genealogy-local-history-requests
Kentucky Digital Library - http://kdl.kyvl.org/
Mary Todd Lincoln House - http://mtlhouse.org/
Bluegrass Trust - http://www.bluegrasstrust.org/
Lexington Cemetery - http://www.lexcem.org
Ashland, The Henry Clay Estate - http://henryclay.org/
Waveland State Historic Site - http://parks.ky.gov/parks/historicsites/waveland/
Hopewell Museum - http://www.hopewellmuseum.org/
The Arboretum Kentucky Children's Garden - http://www2.ca.uky.edu/arboretum/childrens_garden.php
WikiLex: A History Hub - http://lexhistory.org/wikilex