It is a large-format hard cover book with a dust jacket. It measures 10″ x 12 ½” x 1 ½” and weighs a VERY hefty 4 lbs. 12 ½ ounces. It chronicles the aircraft of WW I from every nation, not just the ones most commonly reported. Aircraft are described by type, in detail. It is a must-have book for any collection. [Due to its weight, shipping may be extra].