The LOFAR Two-metre Sky Survey (LoTSS) - III. First Data Release: optical/IR identifications and value-added catalogue

8 figures, 5 tables and 23 pages. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available at https://lofar-surveys.org/ upon publication in the journal. Reproduced with permission from Astronomy & Astrophysics. © 2019 ESO.