December 6, 2017 Discussing the new North American-Pacific Geopotential Datum of 2022 — Part 4 By David B. Zilkoski
August 2, 2017 Discussing the new North American-Pacific Geopotential Datum of 2022 — Part 2 By David B. Zilkoski
June 7, 2017 Discussing the new North American-Pacific Geopotential Datum of 2022 — Part 1 By David B. Zilkoski
