lost & found

i found the following in a frame at goodwill.  at first i thought it was just a piece of art (of the free church in central square, london) but then discovered it was a card.

it reads, "hi mrs carlson; i hope you like oregon.  burlingame misses you so do i.   i hope you like the poem i made up especially for you and mrs jackson it is my most sincere poem yet.  i'll always remember you as my friend, herbert gilbert"

and i can't help but wonder, what is the story here?

alert readers with any clues leading to the author or owner of this missive, please comment...