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Siam in Trade and War - Old Maps of the Nineteenth Century Exhibit

Ooh, there's the Philippines!
In an 1828 map of the East India Isles.
We're all pretty much there. There's Batanes. There's Taytay.
There's the Sooloo Sea.
And an island named St. John's, lying East of Mindanao interestingly marked as "Doubtful".
(Hmm. As in Doubtful it exists? or The people there are Doubtful by nature?)