Subject
Air conditioning
Ventilation
Heating
36
Refrigeration and refrigerating machinery
11
Handbooks, manuals, etc
9
Equipment and supplies
7
Design and construction
6
Electric equipment
5
Elektrik equipment
3
Eletric equipment
3
Air conditioning industry
2
Control
2
Engineering mathematics
2
Examinations
2
Formulae
2
Handbooks, manuals
2
Handbooks, manuals etc
2
Heating and ventilation industry
2
Mathematics
2
Vocational guidance
2
equipment and supplies
2
maintenance and repair
2
Engineering
1