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The vertical-horizontal illusion; an experimental study of meridional disparities in the visual field (1917)
Ritter, Sarah Margaret · Princeton, N.J. and Lancaster, Pa., Psychological review company · leaf 124
CHART III. Length of Standards Varied. SERIES F. SERIES A.Optical illusions
Internet Archive · Princeton Theological Seminary Library · Public domain (published before 1931). Free to use for anything.
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