Roemer's Texas

I have almost finished reading Roemer's Texas. Roemer, a German geologist who traveled in Texas from 1845 to 1847, had incredible insight. His book is considered one of the most reliable sources on Texas from that period, and Roemer not only gives a wonderful description of the land and its inhabitants, but discusses everything from using rattlesnake fat for a lubricant in gun locks to the letters of introduction Native American chiefs carried with them to get the whites to trade with them. Roemer also discusses Texas politics and religion, and he finds it strange that the Americans would send missionaries to Asia and Africa but not minister to the native population on their own continent. This primary source on 19th century Texas should not be overlooked.