Hoogovens Chess tournament 1954
Fotopersburo De Boer
<a rel="nofollow" class="external text" href="https://hdl.handle.net/21.12102/ac55c090-3b9b-15ef-4d66-603605946f09">Noord-Hollands Archief</a>, NL-HlmNHA 1478 09846B00 01