found: Photographs, 1948:inscribed on verso of photographs (Elsa Reger, 18 Jan. 1948)
found: Grove Music Online, viewed Sept. 1, 2016(Max Reger ... In 1902 he married Elsa von Bercken, a Lutheran, in a Protestant ceremony)
found: Wikipedia, viewed Sept. 1, 2016(Elsa Reger. (25 October 1870-3 May 1951) was a German writer, the wife of the pianist and composer Max Reger, whose memory she kept alive by founding an archive, the Max-Reger-Institute and a foundation, all dedicated to him and his work. The foundation is now named after her.)
