Subject
- Forest ecology -- West (U.S.)3
- Aquatic ecology2
- Conifers -- Ecology -- United States2
- Conifers -- Environmental aspects -- West (U.S.)2
- Forest ecology2
- Forests and forestry -- Research -- West (U.S.)2
- Nutrient cycles2
- U.S. International Biological Program. Coniferous Forest Biome2
- U.S. International Biological Program. Coniferous Forest Biome -- Research2
- Watershed ecology2
- Conifers -- West (U.S.) -- Environmental aspects1
- Forests and forestry -- Economic aspects -- United States1
- Forests and forestry -- Research -- Belgium1
- Forests and forestry -- Research -- Czechoslovakia1
- Forests and forestry -- Research -- International cooperation1
- Forests and forestry -- Research -- Netherlands1
- Forests and forestry -- Research -- Poland1
- Forests and forestry -- Research -- Yugoslavia1
- International Biological Programme -- Research -- Belgium1
- International Biological Programme -- Research -- Czechoslovakia1