Possible Clues:

• Number issued, of a newspaper perhaps
• 'Bolt heading off for the Marathon'' - produced by a number of the copies of The Press
• 'Burst of Speed Starting Off The Marathon' - produced by a number of the copies of The Press
• Number in one issue, of newspapers perhaps
• Burst of speed starting off marathon - is that an issue for the paper?
• Number of copies
• Publishing order
• Copies of promotional material occupying much of box
• No. of copies of books
• The number of books published is all over the papers at Marathon