HARVAN - A almost certainly defunct classification compartment or dissemination marking (used by the White Household within the seventies) Entire set up can't be observed on-line AFAIK, but even snapshots from it reveal common codewords from this web page and from the TAO & GCHQ codeword internet pages in addition https://johnathancpzkv.blogkoo.com/the-best-side-of-codeword-59541740