Frier, J. p., & Gazley Frier, M. E. Industrial lighting systems.
Lua i Stíl Chicago (17ú heag.)Frier, John páginas, agus Mary E. Gazley Frier. Industrial Lighting Systems.
Lua MLA (8ú heag.)Frier, John páginas, agus Mary E. Gazley Frier. Industrial Lighting Systems.
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