École d'Orgue was first published in 1862. The edition by Gigout in 1920 seems to be the more well-known edition of the work. The numbering of the pieces in other editions of École d'Orgue (see the editions on IMSLP) refer to his edition, although he emits 8 of the pieces present in the original edition.
This Risoluto belongs between numbers 14 and 15 of the Gigout edition. It is therefore referred to as 14b.
Pierre Gouin has published them all, and his edition is readily available on IMSLP.. Nr 14b is here: http://imslp.org/wiki/Special:ImagefromIndex/130913