Do you want to keep all of the books by a favorite author together, or do you want to separate them by series, in case your favorite author writes several different series? (tabletpcreview.com)
They also carry through several different series, each with its own scale, colors, and media. (haberarts.com)
In the 1990s he experimented with developing several different series of works, often at the same time. (lehmannmaupin.com)