[KevinH]

Yes a postscript (.ps) file is typically generated by a postscript printer driver (it is what is spooled and set to a postscript compatible printer) and contains the commands in text that the printer uses to make it actually print. There are many opensource (ghostscript, cups, pdf2ps on Linux) and commercial tools that can do this (Adobe Acrobat Pro). A ps file is very similar to a pdf file that has been unencoded, and uncompressed.

Extracting the info you need from one should be relatively easy. As for missing page labels (or numbers) these can easily be filled in and interpolated correctly from known page labels or values using a simple spreadsheet or software as it is a one-to-one mapping.

If you can use pdf2ps on your machine it should be easy enough to look at the postscript file in a text editor and look for "showpage" and decide for yourself how hard it would be to extract just what you need.