1. Diagnostic radiology: geography of a high technology;Cockshott;American Journal of Roentgenology,1979
2. On the question of cancer induction by small x-ray doses;Webster;American Journal of Roentgenology,1981
3. Radiology in Nicaragua;Rosenbaum;American Journal of Roentgenology,1979
4. Entropy;Rifkin,1980
5. A second iron age ahead?;Skinner;American Scientist,1976