//-->
Tres constituciones de Campeche : [1861, 1917, 1957]
Trueba Urbina, Alberto, (1957)
Prehistoric intensive agriculture in the Mayan lowlands
Turner", B. L., (1974)
Uncertainty and developmental risk in "pequeña irrigaciõn" decisions for peasants in Campeche, Mexiko
Gates, Gary R., (1972)