Rerum Novarum / [door Paus Leo XIII] ; Quadragesimo anno / [door Pius XI] ; [onder red. van D. Beaufort]
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Rerum Novarum / [door Paus Leo XIII] ; Quadragesimo anno / [door Pius XI] ; [onder red. van D. Beaufort]
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Rerum Novarum
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Rerum Novarum / [door Paus Leo ...... ; [onder red. van D. Beaufort]