Our Political prints are online both through the John Johnson Online Catalogue and (cross-searchable with other collections) through VADS (Visual Arts Data Service). If you are interested in the period around the French Revolution, you will find a rich source of imagery in the Curzon Collection. The Curzon prints are online through Digital Bodleian
However, most of the political material is not digitised and you will need to rely on the Indexes. Please contact the Librarian of the John Johnson Collection for advice and to order material.