| The Basics of NMRA classic online textbook is Joseph Hornack’s Basics of NMR, which introduces to the theory of NMR. | 
| Introductory NMR &MRI by Sir Paul CallaghanPaul Callaghan’s lectures provide an excellent introduction to the physics of magnetic resonance. | 
| NMR periodic tableIt shows which elements are suitable for NMR experiments. Here is the version of Rider University. | 
| NMR Isotopes and FrequenciesA. Jerschow’s version of ordering NMR active elements is also interesting. | 
| NMRDBThis free web-server can be used to directly predict 1D and 2D NMR spectra. |