Which ENTD's are you having trouble finding? The Deep Dungeon one's on the PSP are labelled pretty well as far as I can tell.
Switchback, Palings, Oubliette, Catacombs, Hollow, Stair and Crevasse are entries 0E0 -> 0FC
Voyage is 0D5 -> 0D8
Interstice 0C9 -> 0CC
Terminus 0B1 -> 0B4
They do seem a little unorganized but that is just how they are stored in the game!
Switchback, Palings, Oubliette, Catacombs, Hollow, Stair and Crevasse are entries 0E0 -> 0FC
Voyage is 0D5 -> 0D8
Interstice 0C9 -> 0CC
Terminus 0B1 -> 0B4
They do seem a little unorganized but that is just how they are stored in the game!