Zimdahl, Robert L.
Fundamentals of weed science
Academic Press , 1993
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Zimdahl, Robert L.
Weed science : a plea for thought-revisited
Springer-Verlag, 2012
eBooks
Uvarov, E.B.
A dictionary of science
Penguin Books, 1976
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Reading, Hugo F.
A dictionary of the social science
Routledge & Kegan Paul, 1978
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Political science-Dictionary
Buku Teks