For anyone who comes across this problem in the future, I converted to PDF, since I could more readily manipulate the pages:

1. Convert document to PDF
2. In Adobe Acrobat, make sure that all letters are the same number of pages (if a few letters are shorter or longer, extract them into a separate document(s) for now.)
3. Use the Organize Pages tool in Adobe Acrobat
4. Zoom in/out until all of the first pages line up in one even column.
5. Click and drag to select all first pages.
6. Print selection

Regards,