What is a map
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David M. Mark | Scott M. Freundschuh | I. Vasiliev | G. D. Theisen | J. McAvoy | D. Mark | S. Freundschuh | I. Vasiliev | G. D. Theisen | J. McAvoy | I. Vasiliev | G. Theisen | J. McAvoy
[1] Lynn S. Liben,et al. Children’s Understanding of Maps , 1987 .
[2] J. S. Levey,et al. The New Columbia encyclopedia , 1975 .
[3] Harold Moellering. Real Maps, Virtual Maps and Interactive Cartography , 1984 .