Great 9 book series on the RAF Bomber command losses during World War 2. Books are softcover and each is its first edition. Printing ranges from book 1 1993 to book 9 which was published in 2007. Book show handling and some creasing to covers especially first few editions. First and second have notations or post it notes for some of the flights. It seems as of the original owner was researching and making his notations as he discovered information.