This article expands on the ONA Educational Symposium talk from the 2021 Convention. This article continues the exploration of the Frontier Series which first entered circulation in 2011. Symbolism found on the $10 commemorative, and $20 denomination standard issue and commemorative notes is highlighted. This is the first time the articles have introduced multiple designs on a single denomination within a series.

Published as "In Search of Bill: The 'Frontiers' Series" in The Ontario Numismatist, Volume 62, July-August 2023, pages 118-120, by the Ontario Numismatic Association.