In 1963 Eduard Imhof and Heinz Leuzinger published school maps of the Canton of Grisons. Compared to other Swiss school maps, their work stands out for its excellent shaded relief.
![Canton of Grisons (excerpt)](http://www.reliefshading.com/wp-content/uploads/2014/09/grisons.jpg)
School wall map 1:100,000 and school map 1:250,000 “Graubünden” (Canton of Grisons) (Ticino section) by Eduard Imhof and Heinz Leuzinger 1963.