[Melian]

Baron Trump’s Marvelous Underground Journey
Free in public domain:

https://upload.wikimedia.org/wikisource/en/b/ba/Baron_Trump%27s_marvellous_underground_journey.pdf

[HoneysuckleTN]

Baron Trump’s Marvelous Underground Journey
Free in public domain:

https://upload.wikimedia.org/wikisource/en/b/ba/Baron_Trump%27s_marvellous_underground_journey.pdf
. . . . . . . . . .

A few other places to read it:

https://archive.org/details/barontrumpsmarve00lock_0/page/n9

http://www.gutenberg.org/ebooks/57426

And the audiobook, also in the public domain:

https://archive.org/details/marvellous_underground_journey_1710_librivox