smithsonianlibraries: A conversion table comparing the colors of a variety of different pH indicator dyes from Papers from the Tortugas Laboratory of the Carnegie Institution of Washington v.11 (1917).Full text available here.

smithsonianlibraries: A conversion table comparing the colors of a variety of different pH indicator dyes from Papers from the Tortugas Laboratory of the Carnegie Institution of Washington v.11 (1917).Full text available here.

smithsonianlibraries: A conversion table comparing the colors of a variety of different

Campesine: Silly Symphony - Flowers And Trees (1932)

Spectralmoon.

Rukableu:

Atomic-Chronoscaph: 1970S - Photos By Stephen Shore

Federer7:Napoli Anni 1970Foto: Vezio Sabatini

Undergroundrockpress:1970

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