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- W2247142199 abstract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default.
- W2247142199 created "2016-06-24" @default.
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- W2247142199 date "1972-01-01" @default.
- W2247142199 modified "2023-09-27" @default.
- W2247142199 title "WATER CONTENT OF FRESH CONCRETE MEASURED BY NEUTRON RADIATION" @default.
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