| Turfgrass fertilization - Nitrogen
| Rieke, P. E. 1975. Proceedings of the 16th Illinois Turfgrass Conference. 16: p. 81-85.
| More | 75813 |
| Soil test results from Illinois turf
| Peck, T. R. 1975. Proceedings of the 16th Illinois Turfgrass Conference. 16: p. 86-87.
| More | 75814 |
| Tissue testing as a guide to turfgrass fertilization
| Hall, John R. 1975. Proceedings of the 16th Illinois Turfgrass Conference. 16: p. 88-89.
| More | 75815 |