Hoogovens Chess tournament 1954. Tabe Bas. (Image mirrored to reflect correct position.)
Fotopersburo De Boer
<a rel="nofollow" class="external text" href="https://hdl.handle.net/21.12102/41fd82de-bcb3-c04c-f04d-68b9265b6df3">Noord-Hollands Archief</a>, NL-HlmNHA_1478_09847B00_01