Forums

Books/Periodicals

Detectorist
by Robert Sickler
Successful Coin Hunting
by Charles Garrett
The Minelab Explorer & E-Trac Handbook
By Andy Sabisch

Lost Treasure Magazine
http://www.losttreasure.com/
Western & Eastern Treasures Magazine
http://www.treasurenet.com/westeast/
American Digger Magazine
http://www.americandigger.com/

Site Research/Maps

USGS (US Geological Survey) aka GNIS
http://geonames.usgs.gov/domestic/

Sanborn Fire Insurance Maps
http://sanborn.umi.com/
http://dmc.ohiolink.edu.oh0218.oplin.org/oplinmap.htm

Ohio County Histories (late 1800's) Online
http://www.heritagepursuit.com/

Brainy Geography
http://www.brainygeography.com/

Online References

Richard's Token Site
http://tokencatalog.com/index.php

Class Ring Finder
Lost one?  Found one?
http://www.classringfinder.com

See if your dateless Type I SLQ is a 1916...
1916 Standing Liberty Quarter

Lost Treasure Magazine Field Tests

Photograde
A book for identifying a coin's condition, with pictures.

Full Split Bands on Mercury Dimes

Coin Grading
A good photo reference guide

Abandoned/Forgotten Places

No endorsements of trespass, but these sites contain some really interesting information and lots of pictures.
Abandoned Ohio
http://www.abandonedohio.com/
Ohio Exploration Society
www.ohioexploration.com
Ohio Trespassers
http://www.ohiotrespassers.com/title.html
Illicit Ohio
http://www.illicitohio.com/
Grave Addiction
http://www.graveaddiction.com/abindex.html
Ohio Ghost Towns
http://freepages.history.rootsweb.ancestry.com/~gtusa/usa/oh.htm
Forgotten Ohio
http://www.forgottenoh.com/abandoned.html
Defunct Parks
http://www.defunctparks.com/parks/OH/indexOH.htm
Southwest Ohio Amusement Park Historical Society
http://www.soaphs.com/
flickr photo group: Abandoned in Ohio
http://www.flickr.com/groups/ainohio/
Dead Ohio
http://www.deadohio.com/
Midwest Lost
http://www.midwestlost.com
Collapse Ohio
http://collapseohio.blogspot.com/
Dust to Dust Ohio
http://www.freewebs.com/dusttodustoh/
Digital Underground Railway: Ohio Valley History
http://djsaan.homestead.com/index_djsaan.html

Active Clubs

Dayton Diggers
(Dayton Area)
http://www.daytondiggers.com/
Buckeye Searchers Association of NE Ohio
(Cleveland Area)
http://www.buckeyesearchers.com/
Black Swamp Metal Detecting Club
(Lima Area)
www.blackswamp.weebly.com
Tri-State Historical Research & Recovery Association
(Cincinnati Area)
www.tristatetreasurehunters.com
North Coast Historical Recovery Association  
(Cleveland Area)
http://www.angelfire.com/ultra/treasurehunting/
Central Ohio Metal Detecting Association
(Columbus Area)
www.ohiodetecting.com

Defunct/Unknown Clubs

Due to outdated links these clubs still appear in internet resources.  To my knowledge these clubs no longer exist or are not currently active.

Defunct
North American Historical Research Society
Central Ohio Research and Recovery Club

Unknown Status
NEO Christian Treasure Hunters Association
Tri-County Metal Detecting Club
Falls Buckeye Searcher Association
Columbus Area Recovery Group
Darke County Treasure Hunting Club
Buckeye Treasure Hunters of Ohio
Buckeye Metal Detectorist of Ohio
Ohio Happy Treasure Hunters
Treasure Trackers
Troy Treasure Hunters
Ohio Valley Research & Recovery
Cleveland Recovery Group
Northwest Ohio Research and Recovery Team
http://norrt.50g.com/

Manufacturers

Dealers

Please check the manufacturer's websites for dealers.  Their "dealer locator" will give you the names of dealers near you.  Keep in mind some dealers are part-time and work a regular job as well.

National Organizations

FMDAC
Federation of Metal Detecting and Archaeological Clubs
http://www.fmdac.org/
WWATS
World Wide Association of Treasure Seekers
http://www.wwats.org/
AMDA
American Metal Detecting Association
http://www.amdaonline.net/
SILVER SEEKERS
A unique club, founded in Dover, Ohio. They meet only at organized metal detecting events across the country.  There is no centralized meeting place or time. See their website for more information.
http://www.silverseekers.com/
National Treasure Hunters League (defunct)
International Treasure Hunting Society (defunct)

Organized/Planted Hunts

Buckeye Championship Treasure Hunt
http://www.bcth.org/

DFXonly.com Tom Weaver Memorial Hunt
(Typically held at a site in Ohio)
www.DFXonly.com