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K.  Collins, Gibbons, J., Frissell, N., Montare, A., Kazdan, D., Kalmbach, D., Swartz, D., Benedict, R., Romanek, V., Boedicker, R., Liles, W., Engelke, W., McGaw, D. G., Farmer, J., Mikitin, G., Hobart, J., Kavanagh, G., and Chakraborty, S., ?Crowdsourced Doppler measurements of time standard stations demonstrating ionospheric variability?, Earth System Science Data, vol. 15, no. 3, pp. 1403 - 1418, 2023.\par \par N. A.  Frissell, Ackermann, J. R., Alexander, J. N., Benedict, R. L., Blackwell, W. C., Boedicker, R. K., Cerwin, S. A., Collins, K. V., Cowling, S. H., Deacon, C., Diehl, D. M., Di Mare, F., Duffy, T. J., Edson, L. Brandt, Engelke, W. D., Farmer, J. O., Frissell, R. M., Gerzoff, R. B., Gibbons, J., Griffiths, G., Holm, S., Howell, F. M., Kaeppler, S. R., Kavanagh, G., Kazdan, D., Kim, H., Larsen, D. R., Ledvina, V. E., Liles, W., Lo, S., Lombardi, M. A., MacDonald, E. A., Madey, J., McDermott, T. C., McGaw, D. G., McGwier, R. W., Mikitin, G. A., Miller, E. S., Mitchell, C., Montare, A., Nguyen, C. D., Nordberg, P. N., Perry, G. W., Piccini, G. N., Pozerski, S. W., Reif, R. H., Rizzo, J. D., Robinett, R. S., Romanek, V. I., Sami, S., Sanchez, D. F., Sarwar, M. Shaaf, Schwartz, J. A., H. Serra, L., H. Silver, W., Skov, T. Mulligan, Swartz, D. A., Themens, D. R., Tholley, F. H., West, M. Lou, Wilcox, R. C., Witten, D., Witvliet, B. A., and Yadav, N., ?Heliophysics and amateur radio: citizen science collaborations for atmospheric, ionospheric, and space physics research and operations?, Frontiers in Astronomy and Space Sciences, vol. 10, 2023.\par \par D.  Kazdan and Aidan, M., ?Coherent CW: A Technician?s HF Digital Mode?, ARRL-TAPR Digital Communications Conference. ARRL-TAPR, Virtual, 2021.\par \par J. R.  Hobart, Farmer, J. O., Mikitin, G., Waugh, D., Benedict, R., Cerwin, S. A., Collins, K. V., Kazdan, D., Gibbons, J., Romanek, V. I., and Frissell, N. A., ?Construction and Operation of a HamSCI Grape Version 1 Personal Space Weather Station: A Citizen Scientist?s Perspective?, in American Geophysical Union Fall Meeting, New Orleans, LA, 2021.\par \par K.  Collins, Kazdan, D., and Frissell, N., ?Ham Radio Forms a Planet-Sized Space Weather Sensor Network?, Eos, vol. 102, 2021.\par \par N. A.  Frissell, Joshi, D. Raj, Collins, K., Aidan, M., Kazdan, D., Engelke, W. D., Atkison, T., Kim, H., Cowling, S. H., McDermott, T. C., Ackermann, J., Witten, D., Madey, J., H. Silver, W., Liles, W., Cerwin, S. A., Erickson, P. J., Miller, E. S., and Vierinen, J., ?HamSCI Personal Space Weather Station (PSWS): Fall 2021 Update?, TAPR-ARRL Digital Communications Conference. ARRL-TAPR, Virtual, 2021.\par \par D.  Kazdan, ?Frequency Estimation Techniques?, ARRL-TAPR Digital Communications Conference. ARRL-TAPR, Virtual, 2020.\par \par D.  Kazdan, ?WWV Doppler Receiver (Demonstration)?, in HamSCI Workshop 2019, Cleveland, OH, 2019.\par \par }