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Species Colias eurytheme - Orange Sulphur - Hodges#4210

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Butterflies Through Binoculars: The East
By Jeffrey Glassberg
Oxford University Press, 1999
I grab this book first when I'm looking to identify a butterfly.

The Butterflies of North America: A Natural History and Field Guide
By James A. Scott
Stanford University Press, 1992

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 8: 1-261
By Clarke, J.F.G.
Clarke, J.F.G., 1970. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 8: 1-261 .

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 7: 1-531
By Clarke, J.F.G.
Clarke, J.F.G., 1969. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 7: 1-531.

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 5: 1-581
By Clarke, J.F.G.
Clarke, J.F.G., 1965. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 5: 1-581.

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 4: 1-521
By Clarke, J.F.G.
Clarke, J.F.G., 1963. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 4: 1-521.

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 3: 1-600
By Clarke, J.F.G.
Clarke, J.F.G., 1958. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 3: 1-600.

Catalogue of the types specimens of Microlepidoptera in the British Museum described by Edward Meyrick. 2: 1-531
By Clarke, J.F.G.
Clarke, J.F.G., 1955. Catalogue of the types specimens of Microlepidoptera in the British Museum (Natural History) described by Edward Meyrick. 2: 1-531.

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