I'm just quoting Yori Yoshizuki here:

Could someone write at redump.org forum

these entries are dupes:

Beneath a Steel Sky (USA) (En,Fr,De,Es,It,Pt,Sv) (Alt)

Demon Gate (USA) (v1.2) (666) (Alt)

Final Fantasy VII (USA) (Disc 3) (Alt)

Just convert them from bin+cue to iso

then strip them down 307200 bytes

and voilà same as main dumps.

I haven't whole USA collection to check.

Usually many single bin+cue entries are overdumped with 307200 bytes.

Proggies used are not always exact with extraction.

My two cents

Each case should be chechked, but often it's a different masterdisc with postgap sectors added.