Related Clues:

• Researcher's aid
• Reference section
• Word with card or finger
• Book part
• Alphabetized list
• Stool pigeon
• Numerical scale, perhaps
• End-of-book list
• Organize, in a way
• Almanac feature
• Encyclopedia volume
• Reference list
• New parent, e.g.
• One who assigns an identifying word
• S&P 500, for one