The AskHistorians book list is useful. The list is split by topic. In most cases, there's a short paragraph of review.

You mentioned books specifically, but just in case you're interested in podcasts, there's the AskHistorians podcast with over 100 episodes.

But this is not to discourage discussion, other recommendations, questions, or debate.

Prit Buttar’s “The Splintered Empires” covers the Eastern Front from 1917-1921. As well as the fall of Austria-Hungary. Hope this is helpful!