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Books about Radant:
Radant Horizons by H. M. Tippett (Jan 1, 1956)
Measurement Results of an Affordable Hybrid Phased Array Using a Radant Lens by J. B. Rao (2000)
Borchardt family history: Ancestors and descendants of William and Augusta (Radloff) Borchardt, Pommern, Prussia... by Ruth A Duxbury (1993)