The specific phrase "pdf 11 extra quality" is likely a search string used to find high-resolution digital copies of the book or the version intended for (11ª Classe) students. Key Details of the Book Author : José Maria Relvas.
However, be careful: Relvas is far more famous for his political role (he was the man who proclaimed the Portuguese Republic from the balcony of the Lisbon City Hall in 1910). Some file-sharers may have misattributed generic grammar PDFs to him to attract searches. gramatica portuguesa jose maria relvas pdf 11 extra quality