It was a 900-year old Muslim ‘slave manual’ translated into English from the original Arabic. It was basically a very detailed purchasing manual, describing the cultural and ethnic traits of slaves from different parts of the world in non-Islamic countries. This should not be a surprise since the Quran supports slavery and enable Muslims to keep slaves even (i.e Sudan, Saudi Arabia, Mauritania, United Arab Emirates, Qatar).
Under Islamic laws, slavery is explicitly permitted. As Saudi Sheikh Saleh Al-Fawzan, a member of the Senior Council of Clerics had said in 2003, those who argue that slavery is abolished are “ignorant, not scholars. They are merely writers. Whoever says such things is an infidel.” Muhammad himself was a slaver. He not only owned many male and female slaves, but he also sold, captured, and raped his slaves. Even his wives owned slaves.
The manual demonstrated that Arabs were engaged in enslaving all peoples, not only Africans. Their travels around the world was not as much for mercenary purposes as to catch slaves and loot wealth. The manual also gave indications that Arabs actually created the entire slave export trade in Africa. Bits and pieces from history indicate that Muslims enslaved over 150 million African people and at least 50 million from other parts of the world.