Home › Authors › Andrew L. Christenson 👤 Andrew L. Christenson 6 books Books by Andrew L. Christenson An essential relationship An essential relationship 2015 Coyote Ruin, NA 6654 Coyote Ruin, NA 6654 2013 Tracing archaeology's past 1989 The last of the great expediti The last of the great expeditions 1987 Excavations on Black Mesa, 1983 1985 Modeling change in prehistoric subsistence economies 1980