The Grapes of Wrath, which some believe to be the “Great American novel,” was not only Steinbeck's most well-known work, but is one of the most well-known works in the history of American literature; this book is long and, in the view of some, somewhat imposing, but if you take the time to read it you will certainly be happy that you did, as you will have enjoyed one of the great works to have come out of the last hundred years, while also getting to know Steinbeck extremely well.
Steinbeck published the novel East of Eden about 15 years after The Grapes of Wrath was published; in recent years, the interest in this book has risen, and many people feel that it is an even better work than The Grapes of Wrath – and certainly, it is a more mature version of Steinbeck's writing, with a story that has a very similar feel.
And one of the main reasons why Steinbeck has so many books listed in his bibliography is because he was as well known for his short novellas as he was for his lengthy novels. One of his best short works – and certainly his most well-known – was a little gem called Of Mice and Men, and once you read this, you will finally have a full understanding of the poignancy and power of Steinbeck's works.