PROBLEMS OF PISCICULTURE IN CONNECTION WITH THE DEVELOPMENT OF HYDROTECHNICAL CONSTRUCTION IN BULGARIA by M. Nishkov, Engineer Stoyan Nikolov -- THE NECESSITY OF FULL MECHANICAL AND BIOLOGICAL PURIFICATION OF SEWAGE WATER FROM THE CITY OF SOFIA by Engineer Iv. Ivanovich -- THE PROBLEM OF PURIFYING WATER TO SUPPLY THE CITY OF SOFIA by Engineer Rad Pavlov, Engineer Al. Bakalov.
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