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U.S. Geological Survey Open-File Report 03-307

(a) Flow chart for back-calculation using marginal liquefaction features observed in sectional view where minimum (N1)60 at marginal liquefaction site is only slightly less than minimum (N1)60 at adjacent site of no liquefaction.

Flow chart for back-calculation using marginal liquefaction features observed in sectional view where minimum (N1)60 at marginal liquefaction site is much less than minimum (N1)60 at adjacent site of no liquefaction.

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