Turner, C E Question I. Should There Be Any Difference in the Type of Picture Produced for Classroom Use and That for Popular Education? [electronic resource] - American journal of public health (New York, N.Y. : 1912) Apr 1922 - 270-1 p. digital Publication Type: Journal Article ISSN: 0271-4353 Standard No.: 10.2105/ajph.12.4.270 doi