All that can presently (June 2019) be gleaned from sheet music covers and by internet searching is that Bert Beyerstedt has 3 works published between 1915 and 1919.
Of ragtime interest is Any Old Rag (1915) published by Bert Beyerstedt, Jacksonville, Florida, USA.
Surfers are welcome to contribute information about this composer.
Title
Attribution
Instruments
Source
Remarks
Those Juarez Blues (1919)
B. Beyerstedt (music) Clara Armiston Moody (words) Beyerstedt Bros (perf.)
This list is arranged in chronological order and contains 3 works by Bert Beyerstedt.
It does not claim to be complete and represents only the number of items located. Keys:ER
Title
Year
Attribution
Remarks
Any Old Rag
1915
Just a Girl and a Boy
1918
Those Juarez Blues
1919
Clara Armiston Moody (words) Beyerstedt Bros (perf.)