| Number | Name | Date | Kind |
|---|---|---|---|
| 1747428 | Crawford | Feb 1930 | |
| 1833726 | Stoddard | Nov 1931 | |
| 1954561 | Cygon | Apr 1934 | |
| 3541705 | Nelson | Nov 1970 |
| Number | Date | Country |
|---|---|---|
| 397,533 | Aug 1933 | UK |
| Entry |
|---|
| "Earth Science Stream Table", No. 58100, p. 344, of Cenco 1969 Educational Catalog. |