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J. P. N. L. Roorda van Eysinga and K. W. Smilde
Centre for Agricultural Publishing and Documentation 1981.
Available at 2 libraries
J. P. N. L. Roorda Van Eysinga and K. W. Smilde
Centre for Agricultural Publishing and Documentation 1980
Available at 1 libraries
Centre for Agricultural Publishing and Documentation 1971
Available at 3 libraries
Centre for Agricultural Publishing and Documentation 1969
K. W. Smilde and J. P. N. L. Roorda van Eysinga
Centre for Agricultural Publishing and Documentation 1968