Image: Opponent color circle 1917
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Opponent_color_circle_1917.png (468 × 490 pixels, file size: 20 KB, MIME type: image/png)
Description: An opponent color circle
Title: Opponent color circle 1917
Credit: Psychology, General Introduction
Author: Charles Hubbard Judd
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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