Your father was lucky to take a picture of a barn which was not of strategic importance, because it was very dangerous to take pictures of crash sites, dead airmen, pows etc... some stil did, but risked thier lives. Besides film was rare and expensive and mostly reserved for occupation forces. some civilians had one or two rolls at home , but they were either pre-war, black market, or traded with Germans against food (the Germans lacked eggs and milk and often dwelled in the countryside trying to trade things for food).

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