http://www.nassaucountyfl.com/DocumentView.aspx?DID=3178 - Dec 2010 - Tri-Data study of FD - 89 pages - also available here https://docs.google.com/open?id=19heNdrDbum823G08o-8fNR5F3PK6GRSAcJGf6DyGgsqiIoYsc8fNFYspz_d9 as of Feb 26 2012
www.google.com/maps/d/edit?mid=1XwPP12zP2-eGi-iQ92quVVhjXZvLOkc&usp=sharing zerg90 map of Nassau County created Oct 6 2022 from Jacksonville area map