Related Clues:

• Give, as permission
• Eighteenth U.S. president
• It's usually good to stick to them
• Bits of info
• Sgt. Friday's quest
• Indisputable evidence
• President before Hayes
• Johnson's successor
• Friday request?
• Statistical input
• Appomattox Court House VIP
• Research funding
• Trivia, essentially
• ''My Favorite Wife'' star
• U.S. of the U.S.