This is FSI Russian, the last version published by the Foreign Service Institute, digitized in docbook format and available in dockbook, pdf, html, odt, epub formats.
The docbook format was chosen because it is possible to convert it in many different other formats. It is also a tagged language, which permits to process the document and extract information like the vocabulary, the phrases etc.
The docbook document was processed with 3 different programs/ide: oXygen, pandoc and Xmlmind xbe.
They produced different versions of the document, as the processing parameters are a bit different.
You'll find the different outputs in different directories.
There are 2 versions of the book: a stressed version, and an unstressed one (in different output directories).
output
This is the oXygen output directory. Html, Xhtml, Epub, Epub3 and pdf outputs. The docbook source is named: fsi-book.xml and fsi-book-stressed.xml.
xmlmind-output
Some outputs from Xmlmind xbe program. The docbook source is named: fsi-book.xml and fsi-book-stressed.xml.
odt-out
I processed the docbook document threw pandoc to obtain an .odt document.
I formatted a litle bit the document.
You'll find an extra audio taggued file, which was my attempts to create audio-pdf documents. Now, I switched to EPUB format and built my audio-books in this format (far easier ...)