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I. The bay of the town of Balchik. View of the city. People, buildings, streets. The beach, people bathe in the sea. Rocks.– II. Leather processing factory. Raw leather processing. Workers, machines. Manual processing of the raw material.– III. Alumni of a military school in Sofia on a visit to Pernik mines. They go down to the "St. Anna" mine with an elevator, go to a gallery, miners dig coal. Pi…