Representative res estimate for no-PDF (yellow) study; author preference unknowable. Value -0.19 confirmed against Dahl DEDD ref BJK79 (El-r&c SR -0.19); Dahl cross-check CONFIRMED.
Baughman, M. L., P. L. Joskow, and D. P. Kamat (1979): "Electric Power in the United States: Models and Policy Analysis," MIT Press: Cambridge, Massachusetts