A collection of Henry Cowell's "Hymn and Fuguing Tunes"

This is not be of the most general interest, but I can't find my answer elsewhere. I seem to have fallen in love with the 18 "Hymn and Fuguing Tunes" of Henry Cowell. I think they are physically and spiritually rich, and I respond intensely to them. But I only find them one at a time, spread out over many albums over many decades. Does anyone know of a collection of these compositions? The format almost doesn't matter - a box set of vinyl or CD's would be equally welcome.

Thanks,

David