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DEDICATION This thesis is dedicated to my loving husband. Without his support, patience, love, and calming nature this work would not have been possible. iv ACKNOWLEDGMENTS I wish to thank my committee for their knowledge, support, feedback and patience. Dr. David Bray and Dr. Pallab Mozumder were particularly helpful in the development of my thesis topic and the analysis of my results. I would like to thank Dr. Elvira Duran and the students of CIDIR-Oaxaca for their collaboration and helpdoi:10.25148/etd.fi11051201 fatcat:olcewdrj6jel5kftnm7p7niynq