This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
australian war memorial australianwarmemorial balloon frank hurley james francis western front front ypres observation commonseventcommonground lighter than air lighterthanair observation balloon observationballoon frank hurley frankhurley blackandwhite monochrome outdoor black and white ID Number Maker James Francis Frank Hurley