Period interlinking maps of Leningrad and Novgorod area

Two original maps showing the area between Leningrad and Novgorod. The place where some of the fiercest battles on the eastern front where fought. The maps are drawn onto and show the HKL or HauptkampfLinie. Very hard to find original maps of Leningrad with drawn in positions and most interestingly; the maps are interlinked. They can be placed on top of each other with a interlinking line of positions.