Here is a list of recommended web links, arranged alphabetically by the relevant dictionary entries.
P Top
pattern poetry
http://www.gardendigest.com/concrete
Bibliography and links for pattern and concrete poetry.
poetry
http://www.poets.org
Academy of American Poets: extensive guide to poets and poems.
postcolonial literature
http://www.postcolonialweb.org
General resource for postcolonial literature and theory at National University of Singapore.
Pre-Raphaelites
http://www.pre-raphaelitesociety.org
Site of the Pre-Raphaelite Society.
psychobiography
http://www.psychobiography.com
Specialist resource on psychobiography.
R Top
Renaissance
http://www.english.cam.ac.uk/ceres
Cambridge English Renaissance Electronic Service.
Restoration comedy
http://alojamientos.us.es/restoration
Restoration Comedy Project at University of Seville, catalogues plays and performances.
rhetoric
http://humanities.byu.edu/rhetoric/silva
Silva Rhetoricae (The Forest of Rhetoric): extensive reference source for rhetorical theory and figures.
Romanticism
http://www.rc.umd.edu
Romantic Circles: extensive scholarly resource based at University of Maryland.