Maryland

Condado de Howard - , Maryland

National Society for Histotechnology - Ellicott City, Maryland

Button Farm Living History Center - Germantown, Maryland

Historic London Town & Gardens - Edgewater, Maryland

Chesapeake & Ohio Canal National Historical Park - Williamsport, Maryland

Histoserv, Inc. - Germantown, Maryland

American Histo Labs Inc - Gaithersburg, Maryland