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This paper traces the origins and development of a little-known extractive industry in nineteenth-century Mexico: volcanic sulphur mining. Unpublished documents from Mexican archives, nineteenth-century travel literature, reports from early scientific expeditions, and historical newspapers provide the bulk of data. Documents show how both Mexican and United States interests – indigenous sulphur miners (azufreros) and venture capitalists – confronted the challenges of mining sulphur from the crater of Mexico’s Popocatépetl volcano, at 5,426 meters (17,802 feet) elevation.
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LaFevor, M. 2012. Building a Colonial Resource Monopoly: The Expansion of Sulphur Mining in New Spain (1600-1820). Geographical Review. 102(2): 202-224.
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Mishra, N. B., Crews, K. A., & Neuenschwander, A. L. (2012).Sensitivity of EVI-based harmonic regression to temporal resolution in the lower Okavango Delta. International Journal of Remote Sensing. 33(24), 7703–7726.
In this study, we examined how satellite time-series-based characterization of ecological cycles and trends is sensitive to the temporal depth and spacing of the time series and whether the observed sensitivities were cover and/or cycle specific. The results show that as the temporal depth decreases, the sensitivity to both short- and long-term ecological cycles was lost in the seasonally dynamic environment.
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