What other books did Steinbeck write that deal with human values?

Some other books by Steinbeck that deal with human values include "East of Eden," which explores themes of good and evil, loyalty, and guilt. "The Grapes of Wrath" also delves into themes such as family, dignity, and social justice during the Great Depression. Additionally, "Of Mice and Men" touches on friendship, loneliness, and the pursuit of the American Dream.