I'd written about Bigelow (much of it based on my research into his personal papers in the NY Public Library's manuscript Division, his dispatches to Secretary of State Seward, and Margaret Clapp's biography of Bigelow, Forgotten First Citizen) in my novel, The Last Prince of the Mexican Empire.
In a slice of a few years out of his long, rich and very active life, Bigelow served as US ambassador to France during the US Civil War and the French Intervention in Mexico. He was instrumental in convincing Luis Napoleon to not only refuse to support the Confederacy, but to then withdraw French troops from Mexico. Bigelow also attempted to help the parents of the prince, Agustin de Iturbide y Green, reclaim their child from Maximilian von Habsburg.
Once my novel was published, that was the end of researching Bigelow, so I thought. As I was writing Metaphysical Odyssey into the Mexican Revolution: Francisco I. Madero and His Secret Book, Spiritist Manual, apropos of my translation of that book, imagine my surprise to find that among the American Swdenborgians-- followers of the Swedeish scientist and mystic whose ideas were forerunners to Spiritualism-- was Bigelow. And finding his books about that? A quick search in archive.org turned up this gem.
P.S. Another great tool for researchers is www.worldcat.org For any given book, this shows which libraries have it.
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A Couple of Abolitionists
A Window to the Invisible World: Master Amajur and the Smoking Signatures
Andrew Jackson Davis, the Seer of Poughkeepsie
The Burned-Over District