One of most most memorable Cool Tools podcast episodes was with rare book expert Rebecca Romney. She recently started a new rare book firm in Washington D.C. called Type Punch Matrix and she sent me a catalog (PDF here).
A first edition of Food of the Gods (1904) by H.G. Wells, inscribed by him to his mother-in-law (who lived with him during the composition of War of the Worlds and his other major scientific romances)
A first edition of Journeys to the Planet Mars (1904) by Sara Weiss, a Spiritualist who used remote viewing to visit Mars. The book includes original illustrations of Martian flora, and a Martian glossary!
There's also a first American edition of Frankenstein next to an 1818 review of the true first edition (spoiler: it was not positive). The idea of the project was to pair books together in ways that created a dialogue.