I'm gathering collections of slides from the 1940s and 1950s, scanning them and putting many online here. None of the photos was taken by me. You can see my photos of Puerto Rico here. To learn more about the project and conditions of use for the photos, see my Puerto Rico, 1940s and 1950s blog.

The Archivo Histórico y Fotográfico de Puerto Rico has thousands of old photos of Puerto Rico.

The Library of Congress has some of Jack Delano's photos of Puerto Rico taken in the 1930s and 1940s here.

You can see an introduction to Puerto Rico, its history, people, and culture at the website Welcome to Puerto Rico!