there are 9 volumes in the Yotsuba series.
There are currently 14 volumes of the Yotsuba&! manga series.
actually, there is no episode about Yotsuba there is only the books. Creator of Yotsuba is making Show for azumanga daioh.
Well, Yostuba&! vol. 6 isn't out in stores yet but there is a website that has it translated. It is at or you can google Yotsuba and there should be something that says "Read Yotsuba Online". This website has Yotsuba&! translated in English up to volume 8.
10 volumes.
There are seventeen volumes.
4 volumes
4 volumes
there are 33 volumes
It has 3 volumes.
Yup, they already have!
There are 23 volumes.
it has 566 volumes