- 97th Pennsylvania Volunteer Infantry - www.97thpvi.org
- Association of Mid-Atlantic Civil War Roundtables - www.amartcivilwar.org
- Bradbury Camp Sons of Union Veterans of the Civil War - bradburycamp.home.comcast.net
- Chester County Historical Society - www.chestercohistorical.org
- Delaware Valley Civil War Round Table - www.netreach.net/~dvcwrt
- Fort Delaware Society - www.del.net/org/fort
- Gettysburg Discussion Group - www.gdg.org
- Lancaster County PA in the Civil War - http://www.lancastercivilwar.com
- Mike Kochan's web site on Civil War Torpedoes - www.infernal-machines.com/_sgt/f10000.htm
- Old Baldy Civil War Round Table - www.netreach.net/~cwlm/obcwrt.html
- Union Library Civil War Round Table - ulcwrt.org