Possible Clues:

• Encyclopedic in range
• From ___
• The alphabet
• Forward and backward
• The whole spectrum
• See 36 Across
• Encyclopedic range of knowledge?
• Three-word phrase illustrated by the arrow in the Amazon logo
• 'So here's a story from ___ ...' (start of Mel B's rap in 'Wannabe')
• The whole thing