BY CAROLE KLEMENT HUXELMark Duval of Goffstown made his first 4,000-foot mountain climb in 1994, when a friend invited him along on a hike up Mount Moosilauke. Already an avid climber, Duval and his wife, Nina, had climbed Mount Washington several times, and after climbing “Moose Hillock” he began to make two or three serious climbs a ...