| RefNo | Title | Source |
| DF/MIN/20/8/4 | Steel, Richard Elliot: Crystal measurements book, copper glance | |
| DF/MIN/20/8/3 | Steel, Richard Elliot: Crystal measurements book III, iron pyrites and marcasite | |
| DF/MIN/20/8/1 | Steel, Richard Elliot: Crystal measurements book I, cinnabar and copper pyrite | |
| DF/MIN/20/8/2 | Steel, Richard Elliot: Crystal measurements book II, copper and iron pyrites | |
| DF/PAL/100/60/231 | Steel, R E | |
| DF/PAL/100/62/136 | Steel, R E | |
| DF/PAL/100/60/233 | Steel, R E | |
| DF/PAL/122/1/3 | Newton, Richard Bullen: correspondence | |