Also, there are specific unknown on each floor (except the first). In most dead end rooms though (excluding the basement), you'll find every other unknown. (Just keep using sweet scent, it makes it easier)
You can also find a bunch of stuff in the basement if you can translate the text on the first floor (my advice is to take out the "Memo Pad" and write what it says in shortened versions like TL/BL.)
It should be easy to translate though, so don't fret.
That's all to Solaceon Ruins.