Petersham Craft Center
- Contains picture of the center along with lists of classes and events.
- http://www.petershamcommon.com/craft.htm

Commonwealth Communities - Petersham Massachusetts
- Information about Petersham from state agencies.
- http://www.mass.gov/?pageID=mg2localgovccpage&L=1&L0=home&L1=Resident&sid=massgov2&selectCity=Petersham

Sputtermill Ranch Llamas
- Llama ranch offers sales of breeding stock, stud service, and llama gift items. Business description and contact information.
- http://www.llamaweb.com/east/sputtermill/

First Congregational Parish Unitarian
- Contains information about the church, including history, event listings, pictures, and program schedules.
- http://www.firstparishpetersham.com/

Harvard Forest
- Includes a museum and nature trails, as well as serving as a base for research and education in forest biology. Includes descriptions of the forest, the research, and classes. Owned by Harvard University.
- http://harvardforest.fas.harvard.edu/

EarthStory
- Information on annual community gathering to reconnect with the planet. Photos of past events and registration information.
- http://www.earthstory.org/

Earthlands
- Educational organization and intentional ecological community. Calendar of events and information on facility.
- http://www.earthlands.org/

Berry Engineering
- Family-owned civil engineering and land surveying firm. Describes services and gives contact information.
- http://pages.prodigy.net/berryeng/

Petersham Center School
- Elementary school. Contains a history and photographs.
- http://hea-www.harvard.edu/ECT/petersham.html

Raven Adventures Global Classroom
- Adventure travel company and non-profit service organization dedicated to the preservation of the environment and cultures. Includes descriptions of trips, classes, and projects.
- http://www.ravenadventures.com/