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Geothermal energy linear icon. Ground heat pump ... - Alamy
https://www.alamy.com/geothermal-energy-linear-icon-ground-heat-pump-thin-line-illustration-ecological-house-heating-contour-symbol-vector-isolated-outline-drawing-ed-image337524845.htmlGeothermal energy linear icon. Ground heat pump ... - Alamy
Thermal Energy: Sources, Recovery, and Applications
https://books.google.fr/books?id=QdArDwAAQBAJ&pg=PT1481&lpg=PT1481&dq=thermal+energy&source=bl&ots=Fv6SQggbFw&sig=ACfU3U39LgoGv5BTH65EjuEYzLKTbRGwuw&hl=fr&sa=X&ved=2ahUKEwim982Zqc34AhWTBogKHfzdCpsQ6AF6BQjdAhADThermal Energy: Sources, Recovery, and Applications