Books by Isabel Marris:
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Marris, Isabel, ed.: Essays on Duty and Discipline: A Series of Papers on the Training of Children in Relation to Social and National Welfare (40 essays in 1 volume; London et al.: Cassell and Co., 1913) (multiple formats at Google; US access only)
Additional books by Isabel Marris in the extended shelves:
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Marris, Isabel: Essays on duty and discipline. (Cassell and company, ltd., 1913) (page images at HathiTrust)
Find more by Isabel Marris at your library, or elsewhere.