My colleague Dick Sheaff has built an outstanding collection of ephemera which he has generously made available for viewing online.
Artistic Printing: "[B]etween the late 1870s and the mid-1880s a group of American and British letterpress printers developed a design aesthetic that, at its best, was clean, bold and graphic. In its purest form, ‘Artistic Printing'—as the practitioners themselves labeled the approach—used metal type and brass rules almost exclusively. The results often appear quite fresh to our 21st century eyes."
The following galleries will be of particular interest to typophiles (remarks in quotes are Dick's):