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12by Bottema, TjerkSubjects: “…[Occupational safety., Chemical industry.]…”
Published 1930, 11 januari
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13by Bottema, TjerkSubjects: “…[Textile industry., Working conditions.]…”
Published 1927, 12 november
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15by Bottema, TjerkSubjects: “…[Mining., Steel industry., Strikes.]…”
Published 1928, 8 december
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16by Bottema, TjerkSubjects: “…[Mining., Steel industry., Strikes.]…”
Published 1928, 24 november
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17by Bottema, TjerkSubjects: “…[Petroleum industry., Cartel formation.]…”
Published 1931, 29 augustus
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19by Bottema, TjerkSubjects: “…[Textile industry., Wages., Working hours.]…”
Published 1924, 29 maart
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20by Bottema, TjerkSubjects: “…[Steel industry., Trade union movement.]…”
Published 1927, 24 december
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