Looking at the analytics for my various articles, my book recommendation tend to be the least viewed of all of my article formats (though given the usual content of the Emerald Rangers, perhaps that isn't too surprising). In truth, these book recommendations are designed more along the lines as a passion project, where I get to promote some literary properties that I might not otherwise get to do.
The fact that my book recommendations also tend to be the easiest articles to write and be very brief and succinct is also not a bad reason to continue them, though I do hope that more people will check out some of the series I recommend and review and come to appreciate them as I do.
Which brings me to 1634: The Baltic War. I've made it no secret of my absolute adoration of Eric Flint's Ring of Fire series. The fantastically detailed of world-building built around countless well-grounded characters and a truly unique and strange point of divergence make it both inviting for new readers and very memorable in terms of its dedicated fans, with many people having favorite story threads, characters, and arcs.
In this particular field, 1634: The Baltic War is my favorite book in the entire series. It is the culmination of baseline trilogy that forms the narrative core of the every other book in the series. After 1634: The Baltic War, the 1632 series would begin to diverge into its countless varying story-lines and character arcs. As such, The Baltic War serves as a conclusion to the old model for the series and the introduction to how the succeeding books will work from thereon out.