The works of Al-Kindi , Al-Farabi , Avicenna , Al-Ghazali , Averroes and other Muslim logicians were based on Aristotelian logic and were important in communicating the ideas of the ancient world to the medieval West.  Al-Farabi (Alfarabi) (873–950) was an Aristotelian logician who discussed the topics of future contingents , the number and relation of the categories, the relation between logic and grammar , and non-Aristotelian forms of inference .  Al-Farabi also considered the theories of conditional syllogisms and analogical inference , which were part of the Stoic tradition of logic rather than the Aristotelian. 
We can learn from the images and writings of the time... This site provides an extensive digital collection of original photographs and documents about the Northwest Coast and Plateau Indian cultures, complemented by essays written by anthropologists, historians, and teachers about both particular tribes and cross-cultural topics. These cultures have occupied, and in some cases still live in parts of Alaska, British Columbia, Washington, Oregon, Idaho, and Montana. Maps are available that show traditional territories or reservation boundaries.