Outputting river sand from the Vltava River, source: Böhmerwaldheimat, Fanny Greipl, 1990, ISBN - 3 - 9802353 - 1 - 9

Outputting river sand from the Vltava River, source: Böhmerwaldheimat, Fanny Greipl, 1990, ISBN - 3 - 9802353 - 1 - 9

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