 Either each volume would either be written by one historian on the faculty, or else each topic would be handled by a faculty member throughout the series of volumes, or perhaps another system of specialization would be prescribed.
<clarity>  Either each volume would either be written by one historian on the faculty, or else each topic would be handled by a faculty member throughout the series of volumes, or perhaps another system of specialization would be prescribed.
 Either each volume would be written by one historian on the faculty, or else each topic would be handled by a faculty member throughout the series of volumes, or perhaps another system of specialization would be prescribed.