Final answer:
The most comprehensive information about the resources and people of Oklahoma was provided by Thomas Nuttall, an English botanist and zoologist who explored the region in the early 1800s.
Step-by-step explanation:
The most useful and complete information about the resources and people of Oklahoma came from Thomas Nuttall. Thomas Nuttall was an English botanist and zoologist who traveled through the Oklahoma region in the early 19th century. His observations and notes on the flora, fauna, and Native American tribes of the area have proven invaluable to historians and biologists. Noteworthy were his descriptions of the richness of the natural environment and the diverse cultures of the indigenous people.