Otter & Twin Otter: The Universal Airplanes [signed] [first edition]

Following the success of the Beaver aircraft, the engineers and test pilots who developed it decided to build an airplane that could do everything the Beaver could — with twice the capacity and payload — and the Otter was born. The Otter was a great airplane, but why not make it perfect with twin-engine reliability and nosewheel landing gear? There were complications, but the result, the Twin Otter, was another winner. With more than 100 photographs, Otter and Twin Otter is a must for plane buffs.