1,012 1920 S Изображение: Romanov Empire - Империя Романовых Поиск в мировом общественном достоянии}

P-IV bis, 1920 during World War I

P-IV bis, 1920 Public domain photograph - aircraft, aviation, free to use, no copyright restrictions image - Picryl description

P-IV, 1921 during World War I, Russian Empire

P-IV, 1921 Public domain photograph - aircraft, aviation, free to use, no copyright restrictions image - Picryl description

P-IV, 1921 during World War I, Russian Empire

P-IV, 1921 Public domain photograph of experimental aircraft, prototype, aviation design and development, no copyright restrictions image - Picryl description