Figure 2. Map of PDSI instrumentation for 1934 and 1988.
Figure 3. Map of reconstructed tree ring data for 1863 and 1757, two of the driest years on record.
Figure 4. Drought variability across the United States since 1700.
(Source: NDCD, Cook 1995).
Figure 5. Comparison of variability between tree ring and industrially derived PDSI values.
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