The next time you dust that book shelf, look for these titles...

If you’ve got old books lying around, they could really be worth something. 

They don’t even have to be that old. According to Ken Lopez, a dealer in rare books based in Hadley, Massachusetts, there are several books from the 20th century, even published after 1960, that have significant value. Here are some titles to look for:

• Americana by Don DeLillo (1971). Value: $300 to $500.

• City of Glass by Paul Auster (1985). Value: Around $500.

• Fear and Loathing in Las Vegas by Hunter S. Thompson (1971). Value: $500 to $750.

• Heart Songs and Other Stories by Annie Proulx (1988). Value: Around $300.

• Housekeeping by Marilynne Robinson (1980). Value: $500 to $750.

• Lonesome Dove by Larry ­McMurtry (1985). Value: Around $350. 

• Midnight's Children by Salman Rushdie (1981). Value: Around $750.

• The Bluest Eye by Toni Morrison (1970). Value: Around $5,000. 

• The Godfather by Mario Puzo (1969). Value: Around $3,500.

• The Killer Angels by Michael Shaara (1974). Value: Around $5,000.

• The Orchard Keeper by Cormac McCarthy (1965). Value: Around $3,000. 

• The Spy Who Came in from the Cold by John Le Carré (1963). Value: As much as $500. 

• The World According to Garp by John Irving (1978). Value: $200 to $300. 

If you come across one of these books, you’ll need to be sure it’s a first printing, so check the copyright page for the phrase "First Edition." Not every book is identified there but an experienced dealer will be able to help you identify one.