Add sections to the bookbuilder: Esther Ferrer's Letter to John Cage (Esther Ferrer)

 

With complex structures, e.g., a chapter with subsections, selecting only the chapter is likely to select only the chapter's title, so probably you want to select the chapter and all its subsections.

The text structure is shown below.

 
Section
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Title, author, date...
Esther Ferrer's Letter to John Cage
Source, notes...