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report by the Chaco Commission of the League of Nations https://biblio-archive.unog.ch/Dateien/CouncilMSD/C-154-M-64_EN.pdf
This in an overview of records on the Chaco War & US in Latin America https://www.gale.com/binaries/content/assets/gale-us-en/primary-sources/archives-unbound/primary-sources_archives-unboun…
Thank you so much for all the bibliographic references Susannah. They're amazing and right on point.
Dear Ms. Aguirre,
Thank you for posting your request on History Hub!
We searched the documents of the Office of the Historian for the State Department, which is responsible for the preparation and publication of the official documentary history of U.S. foreign policy in the Foreign Relations of the United States (FRUS) series, and located 196 documents regarding the Chaco dispute between Bolivia and Paraguay
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