[Ger-Poland-Volhynia] Dubno area information

[Cubcruiser at aol.com]

I am researching my grandparents origins.  I believe they came from the 
Dubno, Ukraine area, based on information I've found.  I would like to find 
out if anyone knows of a good source of information on this specific area 
(online or publications).  I'm also trying to identify the town from which 
they came from.  From their 1912 ship manifest records, it appears to be 
something like " Selenaja , Wolhyn, Russia ."  I tied this to the Dubno area 
based on my grandfathers naturalization paperwork (late 1930s - early 1940s), 
which listed his hometown as Dubne, Poland.  (there is a Dubne, Poland today, 
but Dubno, Ukraine seemed to be the more likely candidate - geography, 
agriculture, history, etc.).  He was German, a Lutheran and a farmer, and 
served in the Russian military just prior to departing for the U.S.