Experience in three-colour printing for coloured areas in thematic maps /
Stump, Hans.
Spiess, Ernst
International Cartographic Association.Children and Cartography Commission.
International Geographical Union.
Edinburgh : IGU/ICA Technical Symposium,
1964.
IGU/ICA Technical Symposium (No. S 24 p.)
Includes bibliographical references.
Bartholomew firm library.
Cartography.