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1Published 1931“…Amsterdam: FSI…”
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7Published 1927“…Amsterdam: FSI…”
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10Published 1924“…Amsterdam: FSI…”
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11Published 1922“…Amsterdam: FSI…”
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12Published 1922“…Amsterdam: FSI…”
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13Published 1922“…Amsterdam: FSI…”
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14Published 1922“…Amsterdam: FSI…”
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16Published 1921-1935“…Amsterdam: Internationale Gewerkschaftsbund…”
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17Published 1921-1939“…Amsterdam: FSI; Berlin; Paris…”
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