1. 04. English Audio Visual Acid Rain   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
2. 04. English Audio Visual Recycling   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
3. 04. English Audio Visual Nuclear Energy/Nuclear Waste   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
4. 04. English Audio Visual Global Warming   Publication: Bala Cynwyd, PA . 1 Cassette 1/2 inch Availability: Copies available: (1), Actions:
5. 04. English Audio Visual Clean Air   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
6. 04. English Audio Visual Degradation of the Land   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
7. 04. English Audio Visual Extinction   Publication: Bala Cynwyd, PA . 1 Cassette 1/2 inch Availability: Copies available: (1), Actions:
8. 04. English Audio Visual The Rainforest   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
9. 04. English Audio Visual The Ozone Layer   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions:
10. 04. English Audio Visual Clean Water   Publication: Bala Cynwyd, PA . 1 Cassette(30 minutes) 1/2 inch Availability: Copies available: (1), Actions: