BOOK(S)
My notes used to train the Mexican Mathematical Olympiad were published in Spanish and English. They contain the tools needed to solve any combinatorics problem from a mathematical olympiad.
Outreach​
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"Gerrymandering, Sandwiches, and topology" Notices of the AMS 64(9) pp.1010-1013.
The notices article was highlighted in "october's spotlight" of the AMS math grad blog.
https://blogs.ams.org/mathgradblog/2017/10/10/ams-notices-spotlight-october-2017/
Using Ham Sandwich cuts to gerrymander
I was recently made aware of a similar application of fair partition results to gerrymandering by Macarthan Humphreys. His paper (which also has more references on the subject) can be found here.
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"El principio de las casillas" (in Spanish, "the pigeonhole principle"). Tzaloa 2010 (2) pp. 1-6