@Ishmael121,
That book (hardcover, 16 pages with two facsimiles) was a New Year's gift for the friends of
de Gruyter publisher.
It wasn't on sale (only now in antique bookshops), consists of 16 pages of the
critical edition of the complete works and letters, based on the critical text by G. Colli and M. Montinari, Berlin/New York, de Gruyter 1967-, edited by Paolo D'Iorio (volume 1, part 7).