Answered By: Deborah Kelley-Milburn Last Updated: Jul 15, 2015 Views: 23
I believe you are referring to the Almanach de Gotha. You can read volumes from 1821-1910 online at http://gallica.bnf.fr/ark:/12148/cb32686676p/date.r=%22almanach+de+gotha%22.langEN
It consists of two parts. Part one, "Annuaire Genealogique," is the section that provides genealogies of the royal and princely houses of Europe.