Related Clues:

• Weighty reading?
• Weighty works
• Bibliophile's units
• Books with meat
• Books on stands, usually
• They're not quick reads
• Ponderous books
• Large volumes
• Voluminous volumes
• Humongous books
• They take a while to read
• Fillers of library shelves
• Hefty volumes
• Big fat books
• Alexandria was famous for them