ABOP. . Katholieke Onderwijs Vakorganisatie. . Nederlands Genootschap van Leraren. . ABVA-KABO. . Unie-MTO
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| Institution: | International Institute of Social History |
| Format: | IMAGE |
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| Online Access: | http://hdl.handle.net/10622/BBC21932-8FAD-41D3-86E1-2B4DBCAB5DFF |