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- 14 Topography
- 13 Fisheries
- 13 Food
- 13 Soil
- 12 Carbohydrate
- 12 Plants
- 12 Vegetation
- 11 Climate
- 11 Taxonomy
- 10 Chromatography
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Year Completed
- 63 2020 - 2023
- 231 2010 - 2019
- 258 2000 - 2009
- 206 1990 - 1999
- 166 1980 - 1989
- 79 1970 - 1979
- 37 1960 - 1969
- 20 1950 - 1959
- 1 1940 - 1949