Zamuco is an extinct Zamucoan language recorded during the colonial era in the Jesuit Missions of Chiquitos in Bolivia.https://www.persee.fr/doc/jsa_0037-9174_1961_num_50_1_2481https://www.persee.fr/doc/jsa_0037-9174_1962_num_51_1_1238 It is closely related to Ayoreo.
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