The following document was first released in 2005. In February of 2019, The Black Vault filed a Mandatory Declassification Review (MDR) request for the record to be further declassified. Although some information was, there was not a lot newly revealed.
The 2019 released version is shown below.
Trip to NSA at Ft. Meade, 29 November 1958 [4 Pages, 1.5MB]