This is Gioachino Rossinis "petite messe solennelle" set with the help of lilypond [1].

I am using the Brandus & Dufur edition [2] (probable 1869 according to [3]).
The current modern definitive edition seems to be [4], and its editor has some notes at [5].

[1] http://www.lilypond.org/
[2] http://imslp.org/images/e/ee/PMLP29942-Rossini_-_Petite_Messe_solennelle_%28vs_Brandus%29.pdf
[3] http://www.classicstoday.com/features/RossiniMesse.pdf
[4] https://www.baerenreiter.com/en/sheetmusic/product/?artNo=BA10501
[5] http://humanities.uchicago.edu/orgs/ciao/Introductory/Essays%20from%20CIAO/Petite%20Messe%20versions.htm


Deliberate changes from the source:

. directions like sotto voce distributed to all choir voices
. dynamics are copied from soprano to all choir voices
. I have not written out cautionary accidentals

Soprano
b.23 tie added between g4 and g8: to make midi sound like a single tone

alto
b.77 2nd 4'th: fis4 -> f4

tenor
b.45 where should the slur end, I choose on the b4
b.81 1st 8'th: dis8 -> cis8

basso
b.28 2nd/3rd note: g'4.. g16 -> a'4.. a16
b.51 c2: c2. over "son", probably a typo

Note:
 soprano b.65 2nd c2 could possible be an a2 to make it look like b.14