Natural Features and Ecosystems
Biological Diversity(STG: Summer 1989 Vol. 11 No. 2) Its importance worldwide.
Features on Non-Native Species
Major Floods (under Stories)
How the Gap Formed (general explanation)
Scenic River Protection Continues (STG: Spring 1993 Vol. 15, No. 1) and Scenic River Protection: An Update (STG: Summer 1993 Vol. 15, No. 2) The new water quality standards for the Delaware River, among the nation's highest.
A Drop to Drink (STG: Summer 2001 Vol. 23, No. 2) Delaware River water quality.