All that can presently (June 2019) be gleaned from sheet music covers and by internet searching is that Léon P. Braün has 7 works published in 1910.
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 7 works by Léon P. Braün.
It does not claim to be complete and represents only the number of items located. Keys:ER