I have another question related to managing a book I'm doing building for export 
to LaTeX:  what do people do for managing all of the headers?

I have about 30 #+latex_header lines in the project I'm working on, and I'm 
still just working on it as a basic article.  When I'm ready to do more 
formatting I'll use the memoir class and then there will be more commands.  I 
imagine some of you have huge headers with custom commands and more.

It would be great if there was a way to manage these lines as LaTeX, for example 
in a "#+begin_export latex" block, but as far as I can tell, there isn't a way 
(unless once again I overlooked something).

The idea came up about seven years ago, and Nicolas mentioned the possibility of 
a "#+begin_export latex :header t" implementation.

https://lists.gnu.org/archive/html/emacs-orgmode/2015-05/msg00538.html

It's possible to add a new class to the org-latex-classes variable, and in the 
documentation on it I see there are options ([NO-DEFAULT-PACKAGES], 
[NO-PACKAGES], [NO-EXTRA]) that allow one to trim away all the default headers. 
That makes it easy to take away, but not to add in lines I want, short of 
managing them in my init file.

What sorts of practices do people have for managing lots of LaTeX headers? 
Juan Manuel Macías, you mentioned something like this---literate programming in 
Org to export LaTeX source---may I ask how you do it?

Thanks,

Bill

--
William Denton
https://www.miskatonic.org/
Librarian, artist and licensed private investigator.
Toronto, Canada