Visual Materials
C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous - A chart of cost current for one year.
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C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous - Chart showing cost of electricity for various lamps
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C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous - Chart of cost of employee purchasing protection for compensation during illness.
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C1.1 - Charts miscellaneous - Comparison chart
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C1.1 - Charts miscellaneous - Comparison chart - Electric lamps vs. Gas burner.
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C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous - A chart showing Comparative Cost of Illuminants.
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C1.1 - Charts miscellaneous
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C1.1 - Charts miscellaneous - A chart showing the relative cost of candle hours over a span of six years between 1908 and 1914.
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