Abstract
Several excavations have recently been completed in the Maravilla system, a small abandoned irrigation system in the Valley of Teotihuacan, discovered by Armillas on an aerial photograph in 1954 and reported on by Armillas, Palerm, and Wolf (1956). For a recent summary of irrigation studies in Mesoamerica, see Wittfogel (1957: 19–20). For an earlier summary of climatic conditions in the Valley, see Millon (1954). The present paper is a preliminary report on two of these excavations with additional data on other abandoned and existing systems of irrigation in the Valley.

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