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Multivolume ref.
Else clues• Atlas shelfmate: Abbr.
• Britannica, for one: Abbr.
• Dict. shelfmate
• Funk & Wagnalls offering: abbr.
• It comes in volumes: Abbr.
• Multivolume ref. work
• Multivolume ref., usually
• Ref. bk.
• Ref. set
• Ref. work
• Reference on a CD
• Work in volumes: Abbr.