“The Development of Social Classes and Political Conflicts in Puerto Rico”, in A. López and J. Petras, eds., Puerto Rico and Puerto Ricans: Studies in History and Society, New York: J. Wiley & Sons, 1974, pp. 195-213. (Translation by López of a 1972 article in Spanish.) This book also reproduced “Background to the...”, 1973, pp. 87-117. Article