Mainly research material on authors and subjects with initial letters O, P, R, S, V and W. Includes subject files labelled: Paul Edwards, Doubleday, Yosef Kaplan, Isaac Newton, de Pinto, Potter, Prost on Academic de Saumer, Rene Rapin, Ramsey, Ramus, Raynadout, Pierre Regis, Reid Kames, Rachelieu, Rivkin, Rushworth's Dialogues, Rohault, Sabatai, Solomon, Seixas, Stillingfieet Voetius, Ximinez, and Wilkins.

Correspondence on the The Encyclopedia of Philosophy with Emanuel Geltman, editor of The Free Press.

Correspondence with Doubleday editors regarding RHP’s book “Philosophy made simple”

Correspondence with Lewis Beck on the “The Encyclopedia of Philosophy”

Notes for a course on La Peyrère.

Mainly research material on authors and subjects with initial letters O, P, R, S, V and W. Includes subject files labelled: Paul Edwards, Doubleday, Yosef Kaplan, Isaac Newton, de Pinto, Potter, Prost on Academic de Saumer, Rene Rapin, Ramsey, Ramus, Raynadout, Pierre Regis, Reid Kames, Rachelieu, Rivkin, Rushworth's Dialogues, Rohault, Sabatai, Solomon, Seixas, Stillingfieet Voetius, Ximinez, and Wilkins.

Offprints of Kaplan’s articles.

Mainly research material on authors and subjects with initial letters O, P, R, S, V and W. Includes subject files labelled: Paul Edwards, Doubleday, Yosef Kaplan, Isaac Newton, de Pinto, Potter, Prost on Academic de Saumer, Rene Rapin, Ramsey, Ramus, Raynadout, Pierre Regis, Reid Kames, Rachelieu, Rivkin, Rushworth's Dialogues, Rohault, Sabatai, Solomon, Seixas, Stillingfieet Voetius, Ximinez, and Wilkins.

Copy of the text “Two essays, sent in a Letter from Oxford, to a Nobleman in London” from the edition A Collection of Scarce and Valuable Tracts, on the Most Interesting and Entertaining Subjects: Reign of King William III (cont.) Reign of Queen Anne (1814) [authentic author is John Toland]

contains material regarding RHP’s writings in tribute of Oskar Priest.