In 2000 back issues of this scholarly journal were made available to researchers through JSTOR (Journal Storage). JSTOR offers online access to numerous scholarly journals on a "moving wall" basis -- in which users may download the full text and figures of each article that is at least three-years-old. Currently, JSTOR coverage includes Proceedings: Mathematical, Physical and Engineering Sciences, Vol. 452-453, 1996-1997. Newer articles are continually added on a moving wall basis. Access is limited to participating institutions.