Parnaíba River (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Parnaíba River" in English language version.

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Knepper, Christian (October 2005). "Rumo ao delta" (in Portuguese). National Geographic. Archived from the original on 15 April 2012. Retrieved 3 December 2011.

"Hidrovia do Parnaíba". gov.br - Departamento Nacional de Infraestrutura de Transportes (in Brazilian Portuguese). 2018-12-27. Retrieved 2021-09-19.

APA Delta do Parnaíba (Federal) (in Portuguese), ISA: Instituto Socioambiental, retrieved 2017-02-09

Knepper, Christian (October 2005). "Rumo ao delta" (in Portuguese). National Geographic. Archived from the original on 15 April 2012. Retrieved 3 December 2011.