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12Published 2012Subjects: “…cleaning…”
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15Published 1936.Subjects: “…[City cleaning., Women's labour.]…”
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16by Willemen, KeesSubjects: “…[Air pollution., Cleaning services.]…”
Published 2008, 25 september
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18Published 1980Subjects: “…[Employment conditions., Cleaning services.]…”
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20Published 2011Subjects: “…cleaning…”
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