Este artigo (bem como todos os artigos de interesse lingüístico nesta edição da Revista do Museu Paulista) foi resenhado por John Rowland Rowe (IJAL 16.3.150-151, 1950; disponível aqui). Reconhecendo que Nimuendaju "combined a fine critical faculty with an acquaintance with Indians and ethnological literature that none of his contemporaries could match and the reader of these letters will acquire a great respect for Nimuendajú as a linguist", Rowe conclui que, "[W]ith all due respect to Guérios, who displayed great courage and intellectual honesty in publishing this correspondence, the reviewer is inclined to agree with Nimuendajú about most of the matters under discussion." Ao final da resenha, Rowe oferece pistas quanto à localização de vocabulários cujo paradeiro Nimuendaju desconhecia:

The file of correspondence closes with a letter from A. D. Rodrigues to Nimuendajú and the latter's reply written only three days before his death. Rodrigues inquires what became of the rest of the group of Nimuendajú's vocabularies which Métraux started to publish in the last number of the Revista del Instituto de Etnología of Tucumán in 1932 and Nimuendajú replies that unfortunately he does not know. It happens that I can answer this question: the missing vocabularies are in my office waiting for some attention. Métraux gave them to R. H. Lowie who entrusted them to me last year. There are 20 in all, 8 of Eastern Tucano languages, 3 of Macú, 3 of Carib languages (Macushí, Wapishana, Maquiritare) 2 of Tupí languages (Tupí of the Machado and Itogapuk) and one each of Shiriana, Puinave, Ipuriná and Capishaná.