The Rio Branco, Uraricoera, and Parima: Surveyed by the Expedition to the Brazilian Guayana from August 1924 to June 1925. Pamphlet originally published in the Geographical Journal Feb-March-April 1928, 89pp.
Available in the ‘Folhetos raros’ category of the on-line library of the Museu do Índio, Rio de Janeiro via this link.