Tome of Geological Folklore - coerthas

Hello! I seem to be having a problem I cant seem to trade the Blue Gathererer's Scrip for the Tome of Geological Folklore - coerthas. It says I only can have one but I don't have one in neither my inventory nor with my NPCs, so I am stuck and unable to trade the blue scrips for it so can I have some help either getting the page in my gathering guide or be able to get the page from the NPC. Thank you for your time and trouble.

Character: Afura Mann
Server: Excalibur
NPC: Spenders Vendor
Zone: Idyllshire

Are you sure you haven't already gotten it and used it?

I checked my inventory, NPCs and my gathering log n don't have it nor the logs for it.

Have you tried the "Search for Item" option on the list when looking at the tome on the list?