https://openlibrary.org/books/OL20680637M.opds Ortografia e origem da lingua portuguesa 2009-12-15T07:04:13Z Duarte Nunes de Leao https://openlibrary.org/authors/OL6105570A/Duarte_Nunes_de_Leao Imprensa Nacional-Casa de Moeda (s.l.) 1983 por https://openlibrary.org/books/OL20680637M