Many newspapers place their job listings online. These are just a few papers that you might want to visit:
The News and Sentinel - Colebrook
The Citizen - Laconia, NH
The Conway Daily Sun - North Conway, NH
Concord Monitor - Concord
Foster's Daily Democrat - Dover
The Telegram - Franklin
Keene Sentinel - Keene
The Union Leader - Manchester
Portsmouth Herald - Portsmouth
Employment Times - Throughout NH & Maine