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Fig.2 Yield depletion coefficients of kar st springs of the first type (a,b), second type (c,d) and third type (e,f) versus time: (a) Spring 303/82-1974, (b) Spring 303/82-1984, (c) Spring 308/79-1967, (d ) Spring 308/79-1968, (e) Spring 541/142-1979, (f) Spring 534-1987.

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