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Lewis 2001, p. 124. Lewis, M. J. T. (2001-04-23). "The groma". Surveying Instruments of Greece and Rome. Cambridge University Press. pp. 120–133. doi:10.1017/cbo9780511483035.008.
Lewis 2001, p. 126. Lewis, M. J. T. (2001-04-23). "The groma". Surveying Instruments of Greece and Rome. Cambridge University Press. pp. 120–133. doi:10.1017/cbo9780511483035.008.
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Lewis 2001, p. 122. Lewis, M. J. T. (2001-04-23). "The groma". Surveying Instruments of Greece and Rome. Cambridge University Press. pp. 120–133. doi:10.1017/cbo9780511483035.008.
Lewis 2001, pp. 126–127. Lewis, M. J. T. (2001-04-23). "The groma". Surveying Instruments of Greece and Rome. Cambridge University Press. pp. 120–133. doi:10.1017/cbo9780511483035.008.
Lewis 2001, p. 132. Lewis, M. J. T. (2001-04-23). "The groma". Surveying Instruments of Greece and Rome. Cambridge University Press. pp. 120–133. doi:10.1017/cbo9780511483035.008.
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