book + database = genealogical publication
or
BoD / Amazon + geneanet.org = result of research

Familie Teuthorn-Nagel

(a German edition, but about 50 out of 280 pages written in English)

example book:

Look at Amazon’s for content & index. More than 5o pages in English language.
example database:

More about Auguste JANSSEN
Complete geneanet database:
http://gw.geneanet.org/frankenhusanus / starting with Family Book