Luftwaffe aerial reconnaissance photo of the Baltic Shipyard, Leningrad, showing a Sovietsky Soyuz-class battleship and a Chapayev-class cruiser under construction
Unknown Luftwaffe photographer
Stanley, Roy M., Col. Eastern Front Images: Imagery from WWII and Cold War Intelligence Files. Barnsley, UK: Pen &amp; Sword Aviation, 2016 <a href="//commons.wikimedia.org/wiki/Special:BookSources/978-1-47388-351-2" title="Special:BookSources/978-1-47388-351-2">ISBN 978-1-47388-351-2</a>