For reasons obscure to me Columbia issued a handful of titles as ML4300s and also with an extra digit 5, ML54300s. Here are all of them that I have, I think. In most cases the covers don’t vary at all, they just have an extra digit. To fill in the rows, I show some other cover of the time. I also have a much later Columbia Special Products reissue of one of them, Thomas Merton and Gregorian Chant.