Re. Walter Spector's "Winnitza, Russia", I suggest JewishGen's ShtetlSeeker
in a search using All countries, Daitch-Mokotoff Soundex

http://www.jewishgen.org/ShtetlSeeker/

Search for towns by name
http://www.jewishgen.org/ShtetlSeeker/loctown.htm

Of the 473 results, and lacking additional info pointing in the direction
of present Poland, I favour a location in present Ukraine

Vinnitsa (Leninskiy Rayon), Vinnytsya, Winniza
Coordinates 4914 2829
122.7 miles SW of Kiev

rather than other Ukrainian location

Viynytsya, Voynitsa
Coordianates 5030 2529
221.2 miles W of Kiev

Hope this helps,

Carlos Glikson
Buenos Aires, Argentina