All that can presently (September 2019) be gleaned about William B. Fassbinder from sheet music covers and by internet searching is that he has 11 works published between 1899 and 1909.
Of ragtime interest is Ragelies (1899) published by Royal Music Pub. Co., Minneapolis, Minnesota, USA.
Surfers are welcome to contribute information about this composer.
William B. Fassbinder has at least 4 item(s) at the Amazons which you can order on-line by clicking the item's order icon.