1. Erickson, C. L. & Candler, K. L. in Fragile Lands of Latin America: Strategies for Sustainable Development (ed. Browder, J. O.) 230–249 (Westview Press, Boulder, 1989).
2. Erickson, C. L. Expedition 30(3), 8–16 (1990).
3. Kolata, A. L. & Ortloff, C. J. archaeol. Sci. 16, 223–263 (1989).
4. Ortloff, C. R. & Kolata, A. L. J. archaeol. Sci. 16, 513–535 (1989).
5. Muse, M. & Quintero, F. in Pre-Hispanic Agricultural Fields in the Andean Region (eds Denevan, W. M., Mathewson, K. & Knapp, G.) 249–266 (British Archaeological Reports, International Series 359, Oxford, 1987).