Thousands of books on a wide array of plant science and botanical topics can be found on the top (4th) floor of this library:
| QE 901 – QE 996 | Paleobotany | over 50 books | ||
| QK 1 – QK 100 | Botany (general) | over 500 books | ||
| QK 108 – QK 205 | Plant Distribution (North America) | over 360 books | ||
| QK 215 – QK 474 | Plant Distribution (worldwide) | over 180 books | ||
| QK 474 – QK 488 | Trees and Shrubs | over 130 books | ||
| QK 494 – QK 495 | Plants by… Systematic Divisions | over 160 books | ||
| QK 521 – QK 532 | Ferns | over 40 books | ||
| QK 532 – QK 563 | Bryophytes | over 50 books | ||
| QK 564 – QK 580 | Algae | over 80 books | ||
| QK 580 – QK 597 | Lichens | over 30 books | ||
| QK 600 – QK 635 | Fungi | over 180 books | ||
| QK 640 – QK 673 | Plant Anatomy | over 170 books | ||
| QK 710 – QK 899 | Plant Physiology | over 630 books | ||
| QK 900 – QK 989 | Plant Ecology | over 250 books | ||
| SB 115 – SB 139 | Seeds - Nurseries - Propagation | over 90 books | ||
| SB 160 – SB 317 | Crops | over 440 books | ||
| SB 317 – SB 353 | Horticulture (Vegetables) | over 70 books | ||
| SB 353 – SB 401 | Horticulture (Fruits - Nuts) | over 50 books | ||
| SB 402 – SB 450 | Horticulture (Flowers) | over 350 books | ||
| SB 450 – SB 476 | Gardening | over 310 books | ||
| SB 486 – SB 990 | Plant Pests & Diseases | over 600 books | ||
| SD 1 – SD 390 | Forestry | over 120 books | ||
| SD 391 – SD 410 | Sylviculture | over 50 books |
