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ROS has a support of the current and two previous releases, i. e. indigo and hydro and groovy at the time being. You can still install hydro, it should work without troubles, see: http://wiki.ros.org/hydro/Installation

However, from the user point of view there are no major differences between hydro and indigo, see http://wiki.ros.org/indigo/Migration. You will likely able to understand what's going on if you use indigo while reading your hydro book. "normal" user code is portable in the most cases.