Herman Bouman:
Larus graellsii x intermedius 2cy R-H366
Herman Bouman:
Larus graellsii x intermedius 2cy R-H366
Herman Bouman:
Larus graellsii Y-YK
Herman Bouman:
Larus graellsii R-S9
Herman Bouman:
Larus graellsii W-TN1 W-E
Herman Bouman:
Larus graellsii Blue-GKA.T
Herman Bouman:
Larus graellsii E E120 pale yellow
Herman Bouman:
Larus argentatus wingtag W-4
Herman Bouman:
Larus graellsii Blue ADB
Herman Bouman:
Larus graellsii Blue-CCE
Herman Bouman:
Larus graellsii G-M.AKR
Herman Bouman:
Larus argentatus W-KN21 B-JOO78
Herman Bouman:
Larus argentatus russia W-KN21
Herman Bouman:
Larus argentatus G-M.ABW
Herman Bouman:
Larus cachinnans x argentatus G_33P2 4cy
Herman Bouman:
Herring Gull W-MA003
Herman Bouman:
Larus argentatus ad B-BJAS
Herman Bouman:
Larus argentatus ad Y-PR
Herman Bouman:
Larus argentatus 1cy B-1U1 W-A
Herman Bouman:
Larus argentatus 1cy B-1U1 W-A
Herman Bouman:
Larus argentatus B-CT-AX
Herman Bouman:
Larus graellsii 3cy Y-H018
Herman Bouman:
Larus argentatus 1cy G-K.YAK
Herman Bouman:
Larus argentatus ad G-M.AOT
Herman Bouman:
Larus argentatus G-M.ADW
Herman Bouman:
Larus argentatus Black D and Black S Black S?
Herman Bouman:
Larus argentatus ad L GR R YGY 1
Herman Bouman:
Larus argentatus ad L GR R YGY
Herman Bouman:
Larus argentatus G-Y.ACB
Herman Bouman:
Larus argentatus 2cy W-VF13
