This letter was found in the collection Coleção de Cartas (within Cartas Missivas and Other Documents) which collects, in 4 packs, loose documents of uncertain or incomplete date. The contextualization of each letter is done using information from the letter itself.
If there is no translation for the letter itself, you may copy the text (while using the view 'Standardization') and paste it to an automatic translator of your choice.
