The Nuttall Encyclopedia
E . river of the wood), formed by the junction of the Mamoré and Beni on the borders of Bolivia and Brazil, flows 900 m. NE., and joins the Amazon, as an affluent its longest and largest, and forms a magnificent navigable waterway.
Wood, James, ed. Entry for 'Madeira River'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/m/madeira-river.html. Frederick Warne & Co Ltd. London. 1900.