Bombing damages of the sovjet air raid of January 21st 1940 in Oulu. The chimneys of the destroyed Ainola kindergarten.
Unknown author<span style="display: none;">Unknown author</span>
January 1940 or February 1940
<cite class="book" style="font-style:normal" id="Reference-Rautavaara-1940">Rautavaara, Toivo; Konkka, Juhani (1940)      <i> Kunniamme päivät</i>, <a href="https://en.wikipedia.org/wiki/en:Porvoo" class="extiw" title="w:en:Porvoo"><span title="city in the region of Uusimaa in Finland">Porvoo</span></a>:  Werner Söderström Osakeyhtiö, pp. 22.1  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/N/A" title="Special:BookSources/N/A">N/A</a>. </small></cite>