Jacob F. Schoellkopf Jr., Friedrich Koehler, and Henry Merz’s testimony before the Senate Finance Committee Subcommittee on the Tariff

Jacob F. Schoellkopf Jr., Friedrich Koehler, and Henry Merz’s testimony in 1888 about American aniline chemical production and tariff reforms before the Senate Finance Committee Subcommittee on the Tariff. Testimony Taken by the Subcommittee on the Tariff of the Senate Committee on Finance… (Washington: Government Printing Office, 1888), 1436-1467, 1729-1734.