"The Nile Tributaries of Abyssinia and the Sword Hunters of the Hamran Arabs" is a book written by Sir Samuel White Baker. This work, first published in 1867, details Baker's explorations in the Nile River and its tributaries, specifically in the region of Abyssinia (modern-day Ethiopia) and the interactions with the Hamran Arabs, a group of people in the area. Sir Samuel White Baker was a British explorer, naturalist, big-game hunter, and abolitionist. In this particular book, he describes his travels and adventures along the rivers and waterways that contribute to the Nile's flow. Baker's expeditions in Africa were notable for their focus on geographical discovery, wildlife observation, and encounters with various African cultures.