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Arrastra (Simonin 1877)
Deutsch: Primitive mexikanische Arrastra. Originale Bildunterschrift: L'arasta mexicaine primitive pour l'amalgamation du quartz aurifère.
Arrastra crop - A black and white photo of a fire pit
Placer Mining. The Arastra Gems of California Scenery Public domain photograph - historical image of California, United States, free to use, no copyright restrictions image - Picryl description
Arrastra diagram 1886
Fundamentals of arrastra construction. From Mining and Scientific Press 52 (1886): 237.