Merging scores in one pdf

[sdfhsdfhsdfhs]

is it possible to merge several choirstaff in one pdf, each with its title,
subtitle, instrument name, ... ?
"book" seems to split one .ly into several .pdf; but i have to do the
opposite: several .ly (or one big .ly) into one .pdf.

I tried to merge them with a pdf file merging tool, but it has two major
inconvenients:
1) the resulting pdf is much bigger than the sum of all initial pdfs.
2) if i merge 40 scores that are each 1.25 page long, the resulting pdf will
contain 40x2=80 pages instead of 40x1.25=50.

I did not find anything in the forum about it.

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