Lamp substitution guide
Subtitle: save money by saving energy, calculate your savings.
Contributors: Ontario Hydro.
Edition: 2d ed.
Series: In-house energy efficiency
Publisher: Ontario Hydro
Published: 1990
Place of publication: Toronto, Ont
Language: eng
Subjects: Lighting -- Energy conservation.; Lighting -- Equipment and supplies.; Electric power -- Conservation.; Electric lighting -- Energy conservation.
Notes: Cover title.

Each double leaf contains a double faced slide rule card.

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