What is the person called who is best able to helpt you with your research in most libraries?

When and where was the first Olympics torch relay run? Where are the flaws on a Susan b Anthony dollar? Which 4 active Major League Baseball players has played in the most post season games and how many games it that? Who is the Minister for Health for Portugal? Whose ideas inspired Thomas Jefferson as he drafted the American Declaration of Independence? Senate position just below vice president of the US? Who came up with the idea of Veterans Day? Why did westward migration increase tensions between the North and South? How did the homes change from the Middle Ages to the eighteenth century? How was the nile used for transport of people and goods? What is vulnerable subjects in clinical trials? What was the name of Ivan the Terribles son? Was David Wilmot an abolitionist? What are two ways in which the industrial revolution has affected living things? What states have a town named Trenton? Did Colonial Maryland grow tobacco or cotton? What does the Shang Dynasty have to do with the great wall of china? When Did Jeff Kinney start his writing career? Where were the Canadian confederation conferences held? True or false the senate could appoint a dictator if the two consuls disagreed with each other?