Fantastic Victoriana
By the way, the trail that led me to that e-text started with Jess Nevins' wonderful Fantastic Victoriana site, which covers an enormous breadth of 19th- and early 20th-century science fiction, fantasy, mystery and adventure fiction. The entry on Oz also brought up a few of the points that I make below.
There were far, far more outer-space adventures written in the 19th century than I realized.
There were far, far more outer-space adventures written in the 19th century than I realized.