 A standard edition of Comte’s works does not yet exist and some of the most important ones (the second part of the Course of Positive Philosophy, the whole System of Positive Polity) have been unavailable for many years (in the case of the System, for more than fifty years), until recently. See the Other Internet Resources section below. The most complete edition, which is an anastatic reprint of previously published volumes (essentially 1830–1842 and 1851–1854), is: