I don't mean reference-style books, as I'm aware of the formidable PMEG.
What I'm looking for are books that teach Esperanto in a method similar to that of a school book.
I know of two main ones - Esperanto Learning and Using the International Language and Teach Yourself Esperanto - but the latest publish dates on those that I can find are 2004 and 1992, respectively.
I enjoy learning from a textbook, so when I started learning Esperanto, I was disappointed by the lack of new, up-to-date, recent material, so I settled on the 2004 publication I mentioned above. And I've been told it is on the verge of being out of date.
Is anyone aware of anything else? I've heard rumors that the people at Teach Yourself could possibly be considering an update. Can anyone validate that?