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  1. By: Karsner, Howard Thomas, - Ecker, Enrique E.,
    Publication info: Philadelphia, Lippincott, [1921]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Karsner, Howard Thomas, - Ecker, Enrique Eduardo,
    Publication info: Philadelphia, J. B. Lippincott company, [c1921]
    Holding Institution: University of California Libraries