Calais Observatory - A Different Kind Of Rock Edifice

http://celebrating200years.noaa.gov/survey_marks/heritage_trail/welcome.html

http://www.calaisalumni.org/History/observatory.htm

http://www.calaisalumni.org/History/astronomic.htm

http://www.publicaffairs.noaa.gov/releases2005/jul05/noaa05-r460.html