ACCESSIBILITY AND TECHNOLOGICAL CHANGE IN NORTHERN INDIAFootnote∗∗ The Indian field work profited immeasurably from the assistance of Murty Chadha. Valuable advice and critical comments were provided by David E. Sopher, and Lawrence A. Brown made helpful suggestions on an earlier version of the paper. Financial support was provided by the Division of Earth Sciences, National Academy of Sciences—National Research Council, and the Social Science Research Council.
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