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1“…[Londres] : Trades Union Congress, [1949]…”
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2“…London : The Trades Union Congress, 1982. London : Print. Macdermott and Chant…”
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3“…London : Trades Union Congress, [1949]. London : imp. Victoria House…”
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4“…London : Trades Union Congress, [1948?]. London : imp. Victoria House…”
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