1856 - Lake Ngami
The first British edition was published in London in 1856 by Hurst & Blackett. It has impressive and large lithographs. Harper & Brothers published the first American edition in New York in 1856, but it is a small book and the illustrations are not as impressive, for it has no lithographs.
The Hurst & Blackett production quality far exceeds that of the Harper American first edition.
Below are images of my copy of the first British edition. This edition is over 10 inches tall, and being so large, is very difficult to find in collectible condition. Many copies have foxing, as does my copy.
I also own in its original binding a second edition (which is in reality a second impression of the first edition) that is completely free of foxing, and as such, is very uncommon. I also own a rebound second edition copy that is free of foxing.