- Common Trees of Pennsylvania
 - Identification information. - Fall in PA
- How to enjoy the season in Pennsylvania: fall foliage viewing, bird watching, and driving, hiking, and biking tours.
- Farmpreserve.com
- Devoted to the preservation of precious farmland and open space.
- Pennsylvannia Outdoor Lighting Council
- Goal is to reduce light pollution by educating the public about the safety and nuisance problems of obtrusive and inefficient lighting.
- Winter In PA
- Unlock the treasures of winter in Pennsylvania. Includes snow activities, cool destinations, holidays, and more.
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