Related Clues:

• Thick reference book
• Large volume
• Unabridged dictionary, e.g.
• Webster's 3rd, e.g.
• ''Sock it ---!''
• Heavy book
• It might need two hands to be removed from a shelf
• Big reference volume
• Big volume
• Scholarly book
• Great work
• Weighty book
• "War and Peace," e.g.
• A-B or C-D, e.g.
• Thick textbook