Related Clues:

• Get to the bottom of things?
• Really get into
• Jab
• Like books
• Crack a book
• Use a mattock
• With 52-Across, what treasure hunters do
• Went over
• Examine volumes
• Sarcastic comment
• Be into
• Pore over
• Unkind remark
• First word in a George Bush quote
• "Understand?"