Memorandum from Thomas Gold to J W Findlay, R Dyce, Cdr Slaymaker, T Thompson Telling J W Findlay, R Dyce, Cdr Slaymaker and T Thompson that Dr L Reiffel of the NASA Office of Manned Space Flight expects to visit Arecibo [Ionospheric Observatory] shortly and asking them to make him feel welcome. 4 August 1966