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This topic might have a better name.
This should be Encyclopedia Gallifrey. A shot in the episode clearly shows that there is no A after the Y in the second word.
Talk about it here.
The Encyclopedia Gallifreya was a series of books, in the form of purple liquid in bottles, with at least eleven volumes. Instead of being read, voices could be heard from within the bottles. The Eleventh Doctor owned a copy which he kept in the library of his TARDIS.
When Clara Oswald hid in the library, to escape the time zombie that was following her, volume four of the series began to spill. The vapour contained in the volume floated around the room. (TV: Journey to the Centre of the TARDIS)
Behind the scenes
The name was likely a Gallifreyan play on the Encyclopaedia Brittanica.