The lighthouse <b>Bogskär</b> as seen by an artist in the 19'th century
Not stated
Swedish encyclopedia <i>Nordisk Familjebok</i> from 1926, called <i>Ugglan</i> ("The Owl"); Newer version obtained via halftone scan at <a rel="nofollow" class="external text" href="http://runeberg.org/img/nfbc/0486.pdf">http://runeberg.org/img/nfbc/0486.pdf</a>