vtg Zimmerman Autoharp Instructor Booklet for Zimmerman Autoharp, Style 2 3/4

Description

One family owned. Mine.  We had an autoharp in the 50's, I would think.  Don't know where it went but, found this instruction booklet recently in my mother's estate items.
Seems a shame to just toss it but, I have no use for it.  Hopefully, there's an autoharp player who would understand this music.
I found no date on it.
It is 13 x 9" and obviously has some age and yellowing on it.  No marks on it but, there is a little tear on front cover at the top.  Pictures show you.
Thanks for looking