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How to produce biogas from manure: an overview of the basic principles and design of a production plant How to produce biogas from manure: an overview of the basic principles and design of a production plant Biofuels
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Solar batteries for the garden and home: types, principles of operation and procedure for calculating solar systems Solar batteries for the garden and home: types, principles of operation and procedure for calculating solar systems Solar panels
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Eco-energy
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Solar energy as an alternative energy source: types and features of solar systems Solar energy as an alternative energy source: types and features of solar systems Eco house
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Alternative energy for the home: review of non-standard energy sources Alternative energy for the home: review of non-standard energy sources Eco house
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Geothermal heating systems for a country house: do-it-yourself features Geothermal heating systems for a country house: do-it-yourself features Heat pumps
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