The UNDL Foundation invites submissions to the first volume of the UNL Series, a publication dedicated to technical issues of the UNL. The volume, to be released in May 2013, will be devoted to the lexical aspects of UNL, and will include invited papers from the participants in the I UNL Panel, as well as selected papers from any researchers from inside and outside the UNL Community. The deadline for the submissions is February 15th.