Couple of books on historical voyages of discovery

Lot 1029 limit € 40

1 x Prof. Wallengren "The Great Voyages of Discovery" and 1 x Axel Ahlmann "The Battle for the North and South Pole", from the series "Gefion Verlags Popular Scientific Series", both Berlin: Gefion Verlag, probably 1928, cardboard cover, age and Signs of wear (amongst others the cover is damaged)