Appleby, Andrew B. “Epidemics and Famine in the Little Ice Age.”Journal of Interdisciplinary History 10, no. 4, History and Climate: Interdisciplinary Explorations (Spring, 1980): 643-663. Examines the relationship between climate, famine, and outbreaks of epidemic diseases.
Averner, M. M., and R. D. MacElroy, eds., On the Habitability of Mars: An Approach to Planetary Ecosynthesis. U. S. NASA SP-414, 1976. The mother lode for modern research on terraforming, a detailed NASA study of the practicality of turning Mars into a new Earth, using cyanobacteria and similar microorganisms to alter planetary conditions.
Barnaby, Wendy. The Plague Makers: The Secret World of Biological Warfare. New York: Continuum, 2000. A brief popular introduction to germ warfare, with a survey of known national programs, lots of good information, but suffers from sloppy editing and proofreading.