The Nature of Mathematics, 12th Edition
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Chapter1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
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Links

Video:

Logic Gates using Toys (time: 2:37)
http://www.youtube.com/watch?v=H-53TVR9EOw

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Reference Topics

This site presents an interesting logic calculator:
http://www.inf.unibz.it/~franconi/teaching/propcalc/

These sites considers logic gates (with links to other logic topics):

http://www.phys.ualberta.ca/~gingrich/phys395/notes/node122.html
http://www.jhu.edu/~virtlab/logic/log_cir.htm

This site, Basic Gates and Functions, provides a nice discussion of logic circuits:
http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html