“This is a book for American tourists who a) own no oil wells in Texas, b) are unrelated to the Aga Khan, c) have never struck it rich in Las Vegas and who still want to enjoy a wonderful European vacation,” Frommer once wrote in his annually updated travel guides, per the outlet.

The author came up with itineraries that changed with the times, beginning with Europe on 5 Dollars a Day in 1957 to 2007’s Europe From $95 a Day.