References/Notes/Attributions:
Author(s)
Documentation contributed by Kevin Wright.
Source
Houghton, A., E. W. Munster, and M. V. Viola. (1978). Increased Incidence of Malignant Melanoma After Peaks of Sunspot Activity. The Lancet, 8, 759–760.
References
Cleveland, William S. (1993) Visualizing Data. Hobart Press, Summit, New Jersey.