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barn swallow nest box, barn swallow nest box plans, barn swallow nest box dimensions, barn swallow nest box monitoring, barn swallow nest box maintenance, barn swallow nest box construction, barn swallow nest box attract swallows, barn swallow nest box structures, barn swallow nest box placement, barn swallow nest box hole opening size, barn swallow nest box camera, barn swallow nest box design, barn swallow nest box project, how to build a barn swallow nest box, building barn swallow nest box