Béla Kéler, who was briefly mentioned in an earlier thread about Hungarian Romantics besides Liszt and von Dohnanyi, has his own society – website here (http://www.belakeler.eu/) – and a museum site in his name (http://www.muzeumbardejov.sk/keler/en/index.html) with links to audio and video etc.
Several large scale works appear to be lost, according to those sites.