This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
OregonTrailRutsPhilKonstantin. Oregon Trail ruts Transferred from org en transferred to Commons by User Firefox using de php CommonsHelper Original text selfmade original upload date of Phil Konstantin Original uploader was Philkon at org en Released into the public domain by the author en Philkon original upload