I will need to know if you are conducting independent research or acting as a team, and what your chosen topics of inquiry are. At present, I'm thinking of [Intelligence + Investigation] for computer based research; for traditional library research I am thinking of either [Intelligence + Academics OR Intelligence + Occult] capped by the Investigation skill (there is only so much you can drag out of books. You may voluntarily take a penalty of up to -5 dice per roll representing "deeper research" that involves vetting the source material for hidden truths and secret history.