PLM catalog › Results of search for 'au:"Helms, R. N."'

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		No cover image available Lighting for energy efficient luminous environments / R. N. Helms. 6 by Helms, R. N. 4 0 16, [, ] \| [, ] \| \| , . [] \| 5 6 [] \| . Edition: Source: Language: Unknown language code Summary language: Unknown language code Original language: Unknown language code c1991.46Other title: .Availability: Items available for loan: [Call number: 621.32 H369i 1991] (1). Place hold
		No cover image available Illumination engineering : for energy efficient luminous environment / R. N. Helms. 6 by Helms, R. N. 4 0 16, [, ] \| [, ] \| \| , . [] \| 5 6 [] \| . Edition: Source: Language: Unknown language code Summary language: Unknown language code Original language: Unknown language code c1980.46Other title: .Availability: Items available for loan: [Call number: 621.3212 H37i 1980] (1). Place hold