The Semiology of Graphics: Jacques Bertin. Classic standard on information visualization by French geographer Jacques Bertin. Published first in 1967
Visualization Analysis and Design: Tamara Munzner. Tamara is Professor at the University of British Columbia. Her book spans a huge variety of frameworks and structures in information design and evaluation.
Dear Data: Georgia Lupi, Stefanie Posavec. A book about the Dear Data “experiment”, beautiful hand-drawn data graphics.