Pittsburgh Plate Glass Company · Pittsburgh, PA : The Company · leaf 19
n the report of a carefully controlled research project conducted over a two- year period in the Baltimore, Maryland, City Elementary Schools by the Psychological Laboratory of Johns Hopkins University’s Institute for Co-operative Research. The report stated that the use of Color Dynamics had a…
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Internet Archive · University of Illinois Urbana-Champaign · Public domain (published before 1931). Free to use for anything.
