All that can presently (February 2016) be gleaned about by internet searching is that William E. Slafer is the one-off composer of Brooklyn Daily Eagle Bridge Crush March (1907) published by Goetz & Co., Brooklyn, New York, USA.
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 2 works by William E. Slafer.
It does not claim to be complete and represents only the number of items located. Keys:ER