http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
the Gamopetalae, being a second edition of vol I part II, and vol II part I, collected
by Asa Gray ; published by [as printed] the Smithsonian Institution, Washington.
Volume II, pt. I has special title page: Synoptical flora of North America / by Asa Gray ; Volume II-Part I. Gamopetalae after Compositae.--2d. edition.
Volume I, pt. II, Caprifoliaceae to Compositae originally published in 1884; volume II, pt. I, Gamopetalae after Compositae, in 1878.