Assam: alluvial deposits in the Brahmaputra, above Rakusni Hill. Lithograph. https://www.rawpixel.com/image/13975508/assam-alluvial-deposits-the-brahmaputra-above-rakusni-hill-lithographFree Image from public domain licenseDevil's Kantoor, South Africa: a rocky slope near the De Kaap alluvial gold fields. Woodburytype, 1888, after a photograph… https://www.rawpixel.com/image/13995642/photo-image-plant-airplane-skyFree Image from public domain license