[X] Ask Aemon for his opinion. You will share the full knowledge with him either way, but you trust his assessment on what is and isn't safe to be left here in the open.
[X] Make a copy for the Watch -[X] Deliver it directly to the Lord Commander, to use as he sees fit. -[X] Warn him of how it was previously used, we would recommend that only the must trusted rangers are taught the lore, if he so wishes, he can request that we place some geas on those that are able to learn, to be sure that they wont use it in inappropriate ways.