- Author: Ridpath Ian
- Language: Norwegian
- Year: 2000
- Author: Harald Strøm
- Language: Norwegian
- Year: 1971
- Author: Pedersen Peder Å.
- Language: Norwegian
- Year: 1974
Rørleggeren
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- Author: Rudolf Larsen Torbjørn Mollestad
- Language: Norwegian
- Year: 1976
- Author: Kjølseth Ove
- Language: Norwegian
- Year: 1971
- Author: Bertil Helleberg Sven Åke Paulsson
- Language: Norwegian
- Year: 1967
- Author: Tore Øvensen
- Language: Norwegian
- Year: 1977
Radioteknikk
pdf
- Author: Schröder John
- Language: Norwegian
- Year: 1974
Transportteknikk
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- Author: Virum Per Helge
- Language: Norwegian
- Year: 1973