Ensigns of Dobrovolny Flot from the book <i>An essay on history and operation of Dobrovolny Flot for the 25 years of its existence</i>, Saint Petersburg, 1903
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external free" href="http://mj.rusk.ru/show.php?idar=801220">http://mj.rusk.ru/show.php?idar=801220</a>