This image was acquired from
wikimedia and flickr. 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:
aviation lighter than air lighterthanair balloon observation balloon observationballoon photo border outdoor Ascension d'un ballon captif pour le rglage de l'artillerie. Ascension d'un ballon captif pour le rglage de l'artillerie. Ascension d'un ballon captif pour le rglage de l'artillerie.
aviation balloon lighterthanair observationballoon