Analysis of information sources in references of the Wikipedia article "List of Oberlin College and Conservatory people" in English language version.
...in 1857 began a course of study at Oberlin College, Ohio. Among his studies there was botany, and in this class Powell at last discovered himself and his true vocation - the investigation of natural science. He became an enthusiastic botanist and searched the woods and swamps around Oberlin with the same zeal and thoroughness which always characterised his work. He made an almost complete herbarium of the flora of the county, organising the class into a club to assist in its collection.
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