| Aging of Lakes ▶ |
1971 |
Encyclopaedia Britannica Educational Corporation |
504 |
16mm |
Color |
sound |
| Buffalo: An Ecological Success Story ▶ |
1972 |
Encyclopaedia Britannica Films |
13 |
16mm |
Color |
sound |
| Controversy Over Industrial Pollution: A Case Study |
1972 |
Encyclopaedia Britannica Educ Corp |
16 |
16mm |
Color |
sound |
| Energy - A Matter Of Choice |
1973 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP |
|
16mm |
|
sound |
| Noise - Polluting The Environment |
1971 |
Omega Productions |
|
16mm |
|
sound |
| Problems Of Conservation - Air |
1968 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP 425 N MICHIGAN AVE CHICAGO IL 60611 |
|
16mm |
Color |
sound |
| Problems Of Conservation - Forest And Range |
1969 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP 425 N MICHIGAN AVE CHICAGO IL 60611 |
|
16mm |
Color |
sound |
| Problems Of Conservation - Soil |
1969 |
Encyclopedia Britannica Educ. Corp |
|
16mm |
Color |
sound |
| Problems Of Conservation - Water |
1969 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP 425 N MICHIGAN AVE CHICAGO IL 60611 |
|
16mm |
Color |
sound |
| Problems of conservation : air |
1968 |
Encyclopaedia Britannica Educational Corporation: Distributor | Indiana University Audio-Visual Center: Distributor |
0:15:28 |
16mm |
Color |
sound |
| Problems of conservation : forest and range |
1969 |
Encyclopaedia Britannica Educational Corporation: Distributor | Indiana University Audio-Visual Center: Distributor |
0:14:36 |
16mm |
Color |
sound |
| Problems Of Conservation: Minerals. |
1969 |
Encyclopaedia Britannica Educational Corp. |
0:16:59 |
16mm |
Color |
sound |
| Problems of Conservation: Our Natural Resources |
|
Encyclopaedia Britannica Educ Corp |
11 |
16mm |
Color |
sound |
| Problems of conservation: wildlife ▶ |
1970 |
Encyclopaedia Britannica Educational Corporation |
|
16mm |
|
sound |
| Problems of Conservation: Wildlife |
1970 |
Encyclopaedia Britannica Educ Corp |
13 |
16mm |
Color |
sound |
| THE GARBAGE EXPLOSION ▶ |
1970 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP |
15 |
16mm |
Color |
sound |
| The Salt Marsh - A Question Of Values ▶ |
1975 |
ENCYCLOPEDIA BRITANNICA EDUCATIONAL CORP |
|
16mm |
|
sound |
| The Salt Marsh: A Question Of Values |
1975 |
ENCYCLOPEDIA BRITANNICA EDUC. (FILM |
22 |
16mm |
Color |
sound |