In addition to our main "Letters From American History" collection, we offer a few topic-specific "special collections". Please Note: Special collections are only available in six-month increments.These are the special collections currently available for purchase:Letters From Military History: Get letters from legendary generals, admirals, aviators, spies, and more.Letters About Writing: Get writing advice from best-selling authors like Jane Austen, Edgar Allan Poe, and F. Scott Fitzgerald.Letters On Science & Innovation: Explore the history of science & innovation through the letters of the inventors & titans of industry who made it.