English: The environs of the Paraguayan fortress of Humaitá, revealed by a tethered observation balloon piloted by James Allen, 1868, according to A Vida Fluminense, Rio de Janeiro
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Own work. This is a digitally enhanced and hand-coloured version of the engraving appearing in a supplement to A Vida Fluminense, Rio de Janeiro, 1868, there attributed to the American balloonist James Allen.
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