The written word is a rare and magical thing in a bronze age society. Outside of court scribes, Lhankor Mhy sages and the Lunars is anyone else in Dragon Pass likely to keep good-sized and interesting libraries? Issaries temples would have libraries, but they'd be full of mundane stuff - inventories and loan records. In theory, all temples are places of knowledge, so there is potential for them all to have a library, the extent of which would vary dependent upon the deity, and temple size. Would important Orlanthi marriages be recorded in writing, or just vocalised and witnessed? Would you even marry at a temple?
I imagine writing, depending upon its origins, would be on parchment, paper or clay (and all of these forms found in LM temples, for example). Would friendly or associated cults be likely to allow copying or even loaning of each other's texts? If so, what texts would be permitted, and what would be restricted (apart from obvious cult secrets or matters of court)?