| Class | Date Established |
|---|---|
| G9B | 2008 |
| Plants 1, 2 | 1963 |
| 2 | 1923 |
| 4 | 1923 |
| 5 | 1922 |
| 7 | 1899 |
| 8 | 1938 |
| 12 | 1901 |
| 14 | 1907 |
| 15 | 1921 |
| 16 | 1899 |
| 19 | 1922 |
| 23 | 1924 |
| 24 | 1904 |
| 26 | 1924 |
| 27 | 1919 |
| 28 | 1922 |
| 29 | 1904 |
| 30 | 1937 |
| 33 | 1913 |
| 34 | 1941 |
| 36 | 1900 |
| 37 | 1922 |
| 38 | 1936 |
| 40 | 1901 |
| 42 | 1902 |
| 43 | 1920 |
| 44 | 1920 |
| 47 | 1923 |
| 48 | 1903 |
| 49 | 1966 |