of Washington Press, Seattle, 1971*"The Hydraulic Approach to Pre-spanish Mesoamerica", Austin, 1972*"Some Remarks on Mao's Handling of Concepts and Problems of Dialectics", University of Washington.
of Washington Press, Seattle, 1971* "The Hydraulic Approach to Pre-spanish Mesoamerica", Austin, 1972* "Some Remarks on Mao’s Handling of Concepts and Problems of Dialectics", University of Washington.