In terms of the publication dates, this is complicated since our authors can publish at the click of a button, and can publish as many times as they want. A Leanpub author can publish dozens of times in a month, and can keep updating their book over the course of many years.
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You can find the most recent publication date on each book's web page. We don't provide the first published date, since many of our books are published in-progress. The concept of "first published" means different things to different people, and many people consider it to be when a book was first completed.
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We have never tracked that, since it was never important to us, and since some authors forget to update their book progress bar to be 100% when they actually complete their books...