See these reports and background information on the May 4 referendum in Santa Cruz, Bolivia:
Radio reports/interviews on May 4 Referendum in Santa Cruz
Santa Cruz’s Referendum, Bolivia’s Choice by John Crabtree
Illegal Autonomy Referendum Deepens Division in Bolivia by the Andean Information Network
Right Wing Revolt Threatens Bolivia by Fred Fuentes
The Dark Side of Bolivia’s Half Moon by Benjamin Dangl
Fear and Loathing in Bolivia: New Constitution, Polarization by Benjamin Dangl
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For more in English related to the May 4th referendum, see: