This book contains the celebrated Butcher translation of Aristotle's Poetics, faced, page by page, with the complete Greek text. The editor's 300-page exposition and interpretation follows. I just bought this one in hardback.
I actually read an online version of this text provided by my teacher as part of my Introduction to Drama course, so this is not the same translation I'm writing about, but is the same work. I found the language to be difficult to follow at times, but there is certainly a lot of "meat" here. I could also recognize the importance of what was being said when it comes to analyzing drama and following its early evolution of form. I probably won't be reading it just for fun anytime soon, but I do feel it's an essential part of one's library if they wish to seriously study drama at all.
I'm not saying anything new here but every writer should have a copy of Aristotle's Poetics on their bookshelf for a brilliant reminder of character and plot. No other book can match it in my opinion.