Ser. 4-6 have added t.-p., engr.
The plates to ser. 5 and 6, separately issued in two quarto atlases, are folded and trimmed in this copy, those to illustrate ser. 5 being distributed through the text; the atlas to ser. 6 is bound at end of the volume.
Imrint varies: ser. 1-3 (1868-74) Versaille, Impr. de E. Aubert (cover imprint: Paris, Tross)--ser. 4-6 (1875-86) Paris, E. Leroux (added t.-p.: Paris, Impr. Lemercier & cie)
Six series of studies in the early history and technique of printing, based largely upon contemporary ms. sources and upon minute examination and analysis of specimens of early printing, many of them in possession of the author. ("He utilizes the paleography of the pre-typographic era to interpret and to illustrate the yet hidden subjects connected with the incunabula and their immediate successors."--Bigmore and Wyman, Bibl. of printing) Many of the letters are devoted to the printing done at the monastery of Weidenbach in Cologne by the Brothers of the common life.
Most of the material in ser. 3-6 appeared first in La Typologie Tucker. (Paris, 1874-86)
Titles vary slightly, the author's name not appearing on t.-p. of ser. 1-4.