SUBJECT
Human ecology
51
Environmental education
40
Study and teaching
38
Oceanography
21
Environmental sciences
20
Physical geography
18
Environmental protection
16
Sustainable development
16
Juvenile literature
15
Environmental policy
13
Congresses
12
Geography--Study and teaching
11
Water
11
Anthropology
9
Geography
8
Human evolution
7
Addresses, essays, lectures
6
Environmental aspects
6
Folklore
6
Natural resources
6
Pollution
6
Social life and customs
6
Ecology
5
Environmental management
5
Handbooks, manuals, etc
5
Man
5
Conservation of natural resources
4
Geomorphology
4
Hydrology
4
Influence on nature
4
Marine biology
4
Philippines
4
Remote sensing
4
Anthropo-geography
3
Biological diversity
3
Ethnology
3
Games
3
History
3
Man-Influence of environment
3
Maps
3
Methodology
3
Natural disasters
3
Ocean
3
Popular works
3
Race
3
Social sciences
3
Study and teaching (Secondary)
3
Teacher training
3
1945-
2
Activity programs
2
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