Put these developments in the excavation of Chaco Canyon in the order in which they occurred.

Richard Wetherill conducted a thorough investigation of Chaco Canyon.
George Pepper joined Richard Wetherill and Navajo people to excavate a part of Chaco Canyon.
Neil Judd and college students were joined by Navajo and Zuni workers on a five-year dig in Chaco Canyon.
U.S. Army surveyors explored Chaco Canyon with the help of Native American guides.

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