Introduction Table of Contents color map of El Salvador map of Usulután Figure 1.1 Figure 1.2 Figure 3.2 Figure 3.3 Figure 3.4 Figure 3.5 Figure 3.6 Figure 3.7 Figure 3.9 Figure 7.4 Figure 7.5 cover image black and white photographs More about author Purchase	Map drawn by Carolyn Resnicke of the Santa Fe Institute
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