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The cover will consist of these elements which will overlap the spine, so you are looking at an unfolded version of the sleeve
Folios (page numbers): Set the folios in 9 point bold.
Position: The placement of the running head and the space below to text must be consistent. On left-hand pages the folio should align with the left margin and the running head with the right margin. On right-hand pages the running head should align with the left margin and the folio with the right margin. Allow 1-1/2 lines of space between the running head and the following text, table, illustration, etc. Do not allow additional space if the page begins with a heading, table, illustration, or any element that would normally have additional space above it in running text. Chapter-opening pages, part titles, and front matter opening pages do not have running heads. These pages have drop folios. Position drop folios 1 line below the bottom of the last line of type.