J. K.  Breakall, ?History of Antenna Technology at the Arecibo Observatory, Arecibo Puerto Rico?, HamSCI Workshop 2021. HamSCI, Scranton, PA (Virtual), 2021.

J. K.  Breakall, ?The New Arecibo Ionospheric Modification HF Facility Dual Array Cassegrain Antenna ? History and Design?, in HamSCI Workshop 2019, 2019.