Keyphrases
Forest Soil
100%
Maize
100%
Forested Watershed
100%
Maine
100%
Climate Change
50%
Atmospheric Deposition
50%
Clean Air Act
50%
Biomass Energy
50%
Air Pollution Effects
50%
Manipulative Experiment
50%
Forest Sustainability
50%
Hydrology
50%
Sulfur
50%
Macrofossils
30%
Stratigraphy
30%
Stratified Deposits
20%
Organic Matter
20%
Accelerator Mass Spectrometer
20%
Honduras
20%
Maize Samples
20%
Cultural Material
20%
Early Maize
10%
Grass
10%
Mesoamerica
10%
Radiocarbon Chronology
10%
Radiocarbon Dating
10%
Oaxaca
10%
Calories
10%
Independent Testing
10%
Long Ago
10%
Selection Strategy
10%
Plant Macrofossils
10%
Leather
10%
Plant Material
10%
Focus of Attention
10%
Earliest Plants
10%
World Food Production
10%
Human Use
10%
Plant Remains
10%
Short Intervals
10%
Plant-based Foods
10%
Teosinte
10%
Pottery
10%
Subtropical Region
10%
Preserved Samples
10%
Guatemala
10%
Plant Domestication
10%
National Science Foundation
10%
Staple Crops
10%
Animal Bones
10%
DNA Testing
10%
Cave Deposits
10%
Valley of Mexico
10%
Earth and Planetary Sciences
Stratigraphy
100%
Forest Soil
100%
Maine
100%
Honduras
66%
Mexico
66%
Spectrometer
66%
Atmospheric Deposition
50%
United States of America
50%
Air Pollution
50%
Environmental Impact Assessment
50%
Guatemala
33%
Food Production
33%
Tropics
33%
Radiocarbon Dating
33%
Pottery
33%
Cave Deposit
33%
Organic Matter
33%
Organic Material
33%
Agricultural and Biological Sciences
Forest Soil
100%
Forested Watersheds
100%
Spectrometer
50%
Atmospheric Deposition
50%
Watersheds
50%
Staples
25%
Leather
25%