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1950' (2)

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1950's: Aerial view of paper cone hill marked with regular contours. Regularly shaped hill is replaced by sloping paper cone.
1950's: Aerial view of paper cone hill marked with regular contours. Regularly shaped hill is replaced by sloping paper cone.

1950's: Aerial view of paper cone hill marked with regular contours. Regularly shaped hill is replaced by sloping paper cone.

1950's: 2D representation of paper cone on map, representing hills and physical features on contour map. Pencil points to ravine. Teenage girl consults contour map.
1950's: 2D representation of paper cone on map, representing hills and physical features on contour map. Pencil points to ravine. Teenage girl consults contour map.

1950's: 2D representation of paper cone on map, representing hills and physical features on contour map. Pencil points to ravine. Teenage girl consults contour map.