Subject
Building
59
Plumbing
18
Welding
18
Materials
16
Architecture
14
Architectural design
13
Strength of materials
13
Building material
12
Building materials
12
Engineering
12
Design
11
Machine-shop practice
11
Manufacturing processes
11
Construction industry
10
Architectural drawing
9
English language
9
Mechanical drawing
9
Machine-tools
8
Surveying
8
Mechanical engineering
7
Metal-work
7
Structural engineering
7
Technology
7
Blueprints
6
Carpentry
6
Civil engineering
6
Design and construction
6
Handbooks, manuals, etc
6
Mechanics,Applied
6
Bricklaying
5
Concrete
5
Concrete construction
5
Handbook manuals
5
Interior decoration
5
Machine design
5
Machinery
5
Mechanics
5
Soil mechanics
5
Drawing
4
Engineering design
4
Fluid mechanics
4
Interior architecture
4
Machine shop practice
4
Mathematics
4
Metallurgy
4
Sanitary engineering
4
Structural design
4
Water
4
Woodwork
4
management
4
more ...