English: Callahan House, also known as Jacob Helm House, Delaware Water Gap National Recreation Area, Pennsylvania, USA
Français : Maison Callahan, également connue sous le nom de maison Jacob Helm, aire de loisirs nationale du Delaware Water Gap, Pennsylvanie, États-Unis
{{Information |Description={{en|1=Callahan House, also known as Jacob Helm House, Delaware Water Gap National Recreation Area, Pennsylvania, USA}} |Source=http://www.hscl.cr.nps.gov/insidenps/report.asp?STATE=PA&PARK=DEWA&STRUCTURE=&SORT=3&RECORDNO=21 |Au
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