S. A.  Cerwin, Bilberry, P., Blackshear, S., McMahan, J. T., Collins, K. V., and Frissell, N. A., ?Estimation of Ionospheric Layer Height by Measuring the Time Difference of Arrival (TDOA) Between 1 and 2 Hop Propagation Modes. 2023 Annular Eclipse Observations?, HamSCI Workshop 2024. HamSCI, Cleveland, OH, 2024.