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Northern Brown Argus: Counts for the year 1991
| APR | MAY | JUN | JUL | AUG | SEP | |||||||||||||||||||||
| Week no. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| Site | ||||||||||||||||||||||||||
| Warton Crag LNR | . | . | . | . | . | 4 | 44 | 42 | 68 | 70 | 100 | 58 | 72 | 12 | 8 | 2 | . | . | . | |||||||
| Warton Crag RSPB | . | . | . | . | . | 2 | . | . | . | 14 | 66 | 22 | 16 | 22 | 2 | 4 | . | . | . | . | ||||||
| Leighton Moss | . | . | . | . | . | . | . | . | 2 | 4 | 3 | 9 | 5 | 5 | 4 | 5 | . | . | . | . | ||||||
| Gait Barrows | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Gait Barrows NNR (Warden's) | . | . | . | . | . | . | . | 2 | 6 | 2 | 4 | 4 | 8 | . | . | . | . | . | . | |||||||
| Witherslack Woods LNR | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | |||||||
| Smardale Gill | . | . | . | . | . | . | 3 | 12 | 15 | 27 | 38 | 50 | 42 | 35 | 18 | 1 | 2 | 1 | . | . | . | . | . | |||
| St Cyrus | . | . | . | . | . | . | 5 | . | 1 | 2 | 3 | . | . | . | . | . | ||||||||||
