i am looking for
VDI 2050 Blatt 1 Central heating installations - Central heating installations in buildings - Engineering principles for planning and design
VDI 2050 Blatt 2 Central heating installations - Free-standing central heating installations - Engineering principles for planning and design
VDI 3985 Principles for the design, construction and acceptance of combined heat and power plants with internal combustion engines
thank you in advance



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