Hello Céline, I don't think the score of "Mon pays bleu" has ever been published. However, you can probably fall back on the original English version of the song, versions of which are available on this site. Search for "Durham Town".
Hello A version online ... it would be good to get inspired to redo a clean with MuseScore or another editor ... There's also some sorting out to be done in the chords ...there are a few too many .