| RefNo | Title | Source |
| DF/MIN/20/35/104 | Kangankunde Hill [Nyasaland, now Malawi]: correspondence with Magnus S Garson | |
| DF/MIN/20/35/105 | Kangankunde Hill [Nyasaland, now Malawi]: correspondence with Magnus S Garson | |
| DF/MIN/20/35/103 | Chilwa Island [Nyasaland, now Malawi]: correspondence with Magnus S Garson | |
| DF/MIN/20/35/107 | Chilwa Island [Nyasaland, now Malawi]: descriptions of rocks collected by Magnus S Garson, | |
| DF/MIN/20/35/106 | Chilwa Island [Nyasaland, now Malawi]: descriptions of rocks collected by Magnus S Garson, | |
| DF/MIN/20/35/110 | On the terms dolomite and ankerite: | |