Earth & Environmental Sciences
tree ring
86%
chronology
65%
drought
63%
El Nino-Southern Oscillation
39%
famine
26%
climate
21%
index
20%
agricultural worker
15%
moisture
15%
winter
12%
Southern Oscillation
12%
immigration
11%
food production
10%
program
10%
coniferous tree
10%
standardization
10%
livestock
9%
spectral analysis
9%
rural area
9%
stem
9%
protected area
9%
wildlife
8%
soil
8%
bird
8%
infiltration
8%
cross section
8%
rain
7%
dating
7%
mortality
7%
document
7%
water resource
7%
watershed
7%
cold
7%
runoff
7%
disturbance
7%
habitat
6%
summer
5%
land
5%
basin
5%
trend
5%
temperature
3%
rate
3%
water
3%
Social Sciences
drought
100%
Mexico
64%
reconstruction
35%
climate
31%
agricultural product
21%
farm worker
14%
subversion
12%
Water resources
11%
habitat
11%
age difference
11%
indication
8%
conservation
8%
mortality
8%
rural area
8%
immigration
8%
water
7%
migrant
7%
food
7%
event
5%
trend
4%
management
4%