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Close-up of hand filling out test.
TTM13A08_164

Close-up of hand filling out test.

Close-up of hand filling out test.
TTM13A08_165

Close-up of hand filling out test.

Green liquid in beaker. Photo. David Arky
TTM10A18_429

Green liquid in beaker. Photo. David Arky

Filling in bubble test.
TTM08A03_892

Filling in bubble test.