Kratkij kurs russkogo yazyka. Uchebnik russkogo yazyka dlya nachinayuschih na portugal'skom yazyke. This book, "Breve Manual de Lingua Russa," by N. Potapova, is a replication of a book originally published before 1961. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.