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- 182 Historical
- 177 Problems
- 172 Materials
- 167 Population
- 164 Methodology
- 164 Political
- 162 Protein
- 160 Organic
- 155 Plants
- 153 Evaluation
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Year Completed
- 5065 2010 - 2018
- 3890 2000 - 2009
- 2528 1990 - 1999
- 2225 1980 - 1989
- 1649 1970 - 1979
- 858 1960 - 1969
- 114 1950 - 1959
- 4 1940 - 1949
- 2 1932 - 1939