My version is the 4th edition. It seems an earlier edition than the one I've found over the internet. I couldn't find any year indication, but the prologue is different. It begins:
"Ao apresentar a segunda edição..." (presenting the second edition).
Then he talks about a reformulation of the exercises and so on.
The 1962 edition I've found on the internet begins with:
"Ao apresentar mais uma edição..." (presenting one more edition)
So it seems the 1962 is more than the second edition and my one, which is the 4th, is a kind of reprint of the 2nd, maybe...
In my 4th edition, lesson number 8 is the same, "Licao em do maior" and the author is written as Tarrega.
This whole page is the same, except for the indication of Tarrega and the page numbering. My edition it is page 16, the other one it is page 12.
The unattributed exercise 17, in E minor, from the other edition, is exercise 13 in my edition and Tarrega is there, as the author.
Below this E minor etude, in the 1962 edition it sais:
"Estes pequenos estudos tem o objetivo(...)" (This small studies has the objective)
In 4th edition I have, where this same exercise is number 13, it sais:
"Estes pequenos estudos de Tarrega, (...)" (This small sutdies by Tarrega,). So in my edition he clearly attributes it to Tarrega.
In 4th edition, the last lesson is number 64. There is a text below, saying this is the last lesson from "Tarrega's technique". It sais about the scales with barres that Robledo did all of them, with and without basses, in less than 2 minutes...
Then there are the ending pieces. It is not written second part, it ends with Bach Courante.
The 1962 ed, the last lesson is number 83, the text at the end is missing. Before the pieces it is marked as "2a Parte" (2nd part). It ends with a Bach Gavotte after the Bach Courante. There are other more pieces than my edition.
Later on I will try to post some pictures.
Just found a thesis about the Tarrega school in Brazil:
It comments several methods influenced by Tarrega, such as Prat, Pascual Roch, Fortea and Pujol's.
It also has extensive information and newspaper articles from Robledo activities in Brazil (reviews and programs from some of her concerts).
It has info on Oswaldo Soares as an important Robledo student when she lived in Sao Paulo. It says first edition from Soares method is from 1929. He was also representant and reseller in Brazil of Simplicio guitars. Interesting stuff. In portuguese...