Before we dive into the PDF, we must understand the author. André Gedalge (1856-1926) was a French composer and teacher who served as a professor of counterpoint and fugue at the Paris Conservatoire. His legendary status does not stem primarily from his own compositions (though his Prix de Rome cantata and symphonic works are notable) but from the galaxy of students he taught.
The work is renowned for its rigorous pedagogical approach and its use of examples from masters like J.S. Bach rather than simplified "textbook" snippets. : Specifically covers the scholastic fugue Tratado De Fuga Andre Gedalge Pdf 51