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Graduation towers in Poland. Genesis, current state and future of the phenomenon Salt is one of the materials with many uses. For centuries, its therapeutic values have been emphasized. Former salt mining centres, in which graduation towers were used to concentrate brine, played a special role. Along with changes in the technology of obtaining salt, these devices were gradually withdrawn from the use. Some of them began to perform a spa function, which resulted from the impact of the specificdoi:10.4467/20833113pg.20.007.12549 fatcat:qeiad7ddere2piu2gizdjh2or4