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- [41] 50th anniversary special issue, in memoriam John Jones - Preface JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS, 2007, 50 (9-10): : 735 - 736
- [44] 50TH ANNIVERSARY ISSUE - INTRODUCTION PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING, 1984, 50 (09): : 1273 - 1274
- [45] 50th anniversary issue - A comment CANADIAN VETERINARY JOURNAL-REVUE VETERINAIRE CANADIENNE, 2010, 51 (04): : 345 - 345
- [48] Editorial to the 50th Anniversary Issue IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS, 2021, 51 (01): : 2 - 4