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Where is Wolpa? Maria and Kazimierz Piechotka, Heaven’s Gate: Wooden Synagogues in the Territory of the Former Polish-Lithuanian Commonwealth, Institute of Art, Polish Academy of Sciences, Wydawnnictwo Krupski I S-ka, Warsaw, 2004 have a map that places it Neman River upstream form Grodno.
Shmuel Spector's Encyclopedia of Jewish Life Before and During the Holocaust (p.1461) puts it in the part of the bialystok district that is now Belarus.Historicist (talk) 16:11, 30 January 2009 (UTC)
But... the Piechotkas were important scholars, who lived and wrote in Poland.Historicist (talk) 16:12, 30 January 2009 (UTC)
Synagogues of Europe: Architecture, History, Meaning, Carol Herselle Krinsky, Massachusetts Institute of Technology, 1985, Dover Publications, 1996, p. 225 ff. also says Belarus, but the Piechotkas are so authoritative.Historicist (talk) 16:19, 30 January 2009 (UTC)