My Mother wes adopted in 1946, so i can relate. Her parents met in a cannery in california. the only record we have is from DSS that says her mother was born around 1921 in Oklahoma of indian and irish descent (tribe not stated). Her father was born in Alabama and was of irish and english descent. My Mom was adopted on the 13th of august 1946 in San Jose CA.
Her adoptive parents were John Marion Richard who was born in Roosevelt OK and Claire Catherine Johansen who was born in San Francisco. John was of Indian ancestry but we have no record of his descent either..
Any help on this would help and good luck to you other searchers.