The Indian Travelyan Gold Company (Limited) Sketch map of Cherambadi-Devali District-wynaad : shewing the relative position of the Indian Trevelyan Gold Company Ltd. estates & the reefs & gold workings delineated upon Mr. Brough Smyth's maps.
Indian Trevelyan Gold Company Limited.
London : Waterlow Bros. & Layton,
[1881].
Shows land holdings of various gold mining companies.
Royal Scottish Geographical Society: Black Collection
Gold mines and mining