"I've forged seven links in less than two years so far," Sarella happily explained. "Most of the interesting reads at the Citadel are in the locked library vaults, and none could access them without the full approval of the conclave. And I won't truly ever become a maester anyhow. Either way, according to a certain night's watchman, Winterfell and Castle Black have many books that even the Citadel lacks. They might even have copies of the works that the Citadel has locked up."