A. Hoen & Co. (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "A. Hoen & Co." in English language version.

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Supplement to Group XXVII, Reports of Judges on Appeals, International Exhibition, 1876, Reports and Awards, Group XXVII, United States Centennial Commission, Philadelphia, 1877; page 112.
A. B. Hoen, Discussion of the Requisite Qualities of Lithographic Limestone, with Report on Tests of the Lithographic Stone of Mitchell County, Iowa, Iowa Geological Survey Annual Report, 1902, Des Moines, 1903; pages 339-352.