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U.S. Geological Survey Open-File Report 03-307
Cyclic resistance ratio (CRR) curve. The case history data (raw) are from Ambraseys (1988) and were reduced by Green (2001) according to Youd et al. (2001). Normalized SPT blowcount, (N1)60cs, is adjusted for fines content of soil according to Youd et al. (2001).

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