On this web page you find all issues of 'ad HOC', the newsletter of the (Dutch) 'Historie van de Oceanografie Club' or HOC, that have been published so far. The issues 1-11 are in the Dutch language, but from issue 12 onwards 'ad HOC' appears in English to serve a wider, international audience. However, even without mastering the Dutch language you will value the earlier issues for the links (e.g. to downloadable oceanography books or expedition reports) or to other sources of information. The issues can be viewed or downloaded in pdf-format.