  Consider that The Encyclopedia of Philosophy, published in 1967, which contains articles on over 900 philosophers, did not include an entry for Wollstonecraft, Arendt or de Beauvoir. Moreover, if the index is to be believed, de Beauvoir and Wollstonecraft are not mentioned at all in any article, and Hannah Arendt merits a single mention in an article on “Authority”.  Far from being canonical, these women philosophers were scarcely even marginal, warranting perhaps a passing reference in a survey of existentialism or political philosophy, but little  more.[10]  By 1998, however, The Routledge Encyclopedia of Philosophy had entries for all three, and also many other important women philosophers.