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@InCollection{FriendlyPalsky06,
author = {Michael Friendly and Gilles Palsky},
title = {Thematic Maps and Diagrams: Visualizing Nature and Society},
year = {2007},
publisher = {University of Chicago Press},
address = {Chicago, IL},
booktitle = {Maps: Finding Our Place in the World},
editor = {James R. Akerman and Robert W. Karrow},
pages = {205–251},
isbn = {0-226-01075-9},
url = {http://datavis.ca/papers/Maps_Chapter5-ocr.pdf},
}