: Sites like Geneteka or Foundation for Medieval Genealogy (FMG) do not host the PDFs directly but often cite the volumes. The FMG's Charles Cawley's Medieval Lands project is a digital alternative that covers much of the same data with updated research. Internet Archive & Google Books : You can find snippets or older, out-of-copyright volumes (specifically the " Alte Folge " or Old Series) by searching for "Isenburg Stammtafeln" on Archive.org . WorldCat : Use WorldCat to find the nearest physical library or university that holds the New Series ( Neue Folge ). Many academic institutions allow digital scanning of specific pages for research purposes. Digital Libraries