Santayana’s Works
Santayana’s works at Project Gutenberg
http://www.gutenberg.org/browse/authors/s#a5805
Santayana’s works at Archive.org
http://www.archive.org/search.php?query=santayana
Santayana’s works at Google Books
http://www.google.com/search?tbo=p&tbm=bks&q=inauthor:george+inauthor:santayana&tbs=,bkv:f&num=10
Secondary Sources
Overheard in Seville: Bulletin of the Santayana Society
https://santayana.iupui.edu/santayana-society/bulletin/
or
http://ulib.iupui.edu/digitalscholarship/collections/Santayana
Santayana in the Stanford Encyclopedia of Philosophy
http://plato.stanford.edu/entries/santayana/
Santayana in the Internet Encyclopedia of Philosophy
http://www.iep.utm.edu/s/santayan.htm
Limbo
https://dialnet.unirioja.es/servlet/revista?codigo=11264
A Spanish Language Blog
http://internationalconferenceonsantayana.blogspot.com.es/
Blog on Santayana
http://www.chrisskowronski.com/category/santayanas-guide/
A Santayana Homepage
http://www.george-santayana.org/
Santayana in Wikipedia
http://en.wikipedia.org/wiki/George_Santayana
American Philosophy
Society for the Advancement of American Philosophy
http://www.american-philosophy.org/
Pragmatism Cybrary
http://www.pragmatism.org/
Centro de Estudos em Filosofia Americana
http://cefa.weebly.com/
Groupe d’Etudes sur le Pragmatisme et la Philosophie Américaine
http://pragmatisme.free.fr/
Institute for American Thought
https://iat.iupui.edu/
Charles S. Peirce Society
http://www.peircesociety.org/
Arisbe: The Peirce Gateway
http://www.cspeirce.com/
Institute for Studies in Pragmaticism
http://www.pragmaticism.net/
William James Society
http://www.wjsociety.org/
Josiah Royce Society
http://www.roycesociety.org/
John Dewey Society
http://johndeweysociety.org/
The Mead Project
http://www.brocku.ca/MeadProject/
Critical Editions
Center for Dewey Studies John Dewey
http://deweycenter.siu.edu/
Peirce Edition Project Charles S. Peirce
https://peirce.sitehost.iu.edu/
The Frederick Douglass Papers
https://frederickdouglass.infoset.io/index.php
The Josiah Royce Edition
https://royce-edition.iupui.edu/
Kellie Dawson
Grazie!