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- [4] 50TH ANNIVERSARY ISSUE - INTRODUCTION PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING, 1984, 50 (09): : 1273 - 1274
- [5] 50TH ANNIVERSARY ISSUE - INTRODUCTION UNIVERSITY OF CHICAGO LAW REVIEW, 1983, 50 (02): : R9 - R9
- [8] SPECIAL ISSUE FOR 50TH ANNIVERSARY - INTRODUCTION LYON PHARMACEUTIQUE, 1975, 26 (04): : 329 - 330
- [10] 50TH ANNIVERSARY SPECIAL ISSUE Introduction JOURNAL OF ENVIRONMENTAL EDUCATION, 2019, 50 (4-6): : 241 - 250