is it possible to have Preludes et Harmonies poetiques et religieuses s171d sheet music ? i m not sure if they were even published so far.. thx for answering me
Actually, the whole set has been published by Edito Musica Budapest in a collection entitled, "Harmonies poétiques et religieuses - Earlier versions, Suppl. 6", from December 2009. While I took one of my usual visits to Hungary, I was lucky enough to find a copy of this back when it first came out at the Rózsavölgyi music store in Budapest.
Unfortunately, I can't photocopy it to you because it's still copyrighted (and probably will be for decades to come). However, I advise you to check kotta.info and order a copy yourself! Even though it's costs a lot money, it's definitely worth it.

Good luck,
Lisztrachmaninovfan
Note: Leslie Howard completed several of the pieces himself, as Liszt left many of them incomplete. If you have is CD, you should follow his liner notes if you plan on playing a legitamate realization of these pieces, unless if you feel like completing some of them yourself. Even though the EMB publication has several pages of notes on the pieces (in German, Hungarian, and English), a few of their facts are incorrect (such as the Prose des Morts being incomplete, when really it's just an insert to the first version of the piece).