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- [7] Fifty years' progress in the pulp industry INDUSTRIAL AND ENGINEERING CHEMISTRY, 1926, 18 : 917 - 919
- [8] Fifty Years of Progress in Agricultural Mechanization AMA-AGRICULTURAL MECHANIZATION IN ASIA AFRICA AND LATIN AMERICA, 2020, 51 (04): : 64 - 66
- [10] Fifty years in technical progress' vanguard Khimicheskoe I Neftegazovoe Mashinostroenie, 2001, (06): : 21 - 28