| J | F | M | A | M | J | J | A | S | O | N | D | Country | Locality |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 111 | 111 | 111 | Danube River | ||||||||||
| 111 | 111 | Russia | Enisey river | ||||||||||
| 111 | 111 | 111 | 111 | 111 | Europe | ||||||||
| 111 | 111 | 111 | France | France | |||||||||
| 111 | 111 | 111 | UK | Main Lake, Buckinghamshire, 1986-1987 | |||||||||
| 111 | 111 | Not specified | |||||||||||
| 111 | 111 | 111 | 111 | UK | not stated | ||||||||
| 111 | 111 | 111 | Germany | Schleswig-Holstein | |||||||||
| 111 | 111 | 111 | UK | Slapton Ley | |||||||||
| 111 | 111 | Finland | Southern Lake Region | ||||||||||
| 111 | 111 | UK | St. Peter's Lake, Buckinghamshire, 1987 |