Picture 1: Franklin D. Roosevelt, 32nd President. Taken by Elias Goldensky (1868-1943) - This image is available from the United States Library of Congress's Prints and Photographs division
Picture 2: John F. Kennedy, 35th President. This image is available from the Official White House Photograph U.S. National Archives and Records Administration
Picture 3: Richard Nixon, 37th President. This image is available from the Official White House Photograph U.S. National Archives and Records Administration
Picture 4: Ronald Reagan, 40th President. This image is available from the Official White House Photograph U.S. National Archives and Records Administration