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Tide gauge with overlapping tide staffs because of high range of tide

Tide gauge with overlapping tide staffs because of high range of tide Photo

Mayfly larva (Ephemerella sp.)

Mayfly larva (Ephemerella sp.) Photo

Stone fly larva (Perlidae)

Stone fly larva (Perlidae) Photo

After the ice receded, these boats were used for hydrography in the Be...

After the ice receded, these boats were used for hydrography in the Beaufort Sea . Photo

Dragon fly larva (Argia sp.)

Dragon fly larva (Argia sp.) Photo

Black fly pupa (Simulum sp.)

Black fly pupa (Simulum sp.) Photo

Just another day with near white-out conditions

Just another day with near white-out conditions Photo

Marvin Paulson on the left and Francis Popper on the right.

Marvin Paulson on the left and Francis Popper on the right. Photo

Main street on an Arctic Field Party Camp somewhere.

Main street on an Arctic Field Party Camp somewhere. Photo

Black fly larva (Simulum sp.)

Black fly larva (Simulum sp.) Photo

Clam (Musculium sp.)

Clam (Musculium sp.) Photo

Base camp at Kotzebue, Alaska, before the field work began.

Base camp at Kotzebue, Alaska, before the field work began. Photo

Ponds are constructed to control flow of water into various portions o...

Ponds are constructed to control flow of water into various portions of the refuge Photo

Survey crew member trailers at Colfax, Washington.

Survey crew member trailers at Colfax, Washington. Photo

Yellow-headed black bird ( Xanthocephalus xanthocephalus).Yellow-Headed Blackbird

Yellow-headed black bird ( Xanthocephalus xanthocephalus). Photo

Two wading birds near the water - Bear River Wildlife Refuge, UtahBirds

Two wading birds near the water - Bear River Wildlife Refuge, Utah Photo

Triangulation observing party ready to pack in to a station.

Triangulation observing party ready to pack in to a station. Photo

Crane type bird flying - Bear River Wildlife Refuge, UtahCrane

Crane type bird flying - Bear River Wildlife Refuge, Utah Photo

Two water birds flying above a stream - Bear River Wildlife Refuge, Ut...Birds

Two water birds flying above a stream - Bear River Wildlife Refuge, Utah Photo

Water-bird habitat.Birds

Water-bird habitat. Photo

Two Shore Birds at Bear River Wildlife Refuge, UtahBirds

Two Shore Birds at Bear River Wildlife Refuge, Utah Photo

A melange of migrating birds following Spring to the north.Birds

A melange of migrating birds following Spring to the north. Photo

Bombardment of Fort Sumter and adjacent forts by the Union Fleet in Ch...

Bombardment of Fort Sumter and adjacent forts by the Union Fleet in Charleston Harbor. Photo

Three mute swans in the marsh with Assateague light house in the backg...Mute Swan

Three mute swans in the marsh with Assateague light house in the background. Photo

Dry Grass - Estuarine Research Reserve Collection

Dry Grass - Estuarine Research Reserve Collection Photo

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