Edward Stratemeyer 
Rover Boys on a Tour [PDF ebook] 
Or, Last Days at Brill College

Set off for adventure with the mischievous but essentially good-hearted trio of brothers known as the Rover Boys. In this book, the last entry in the original Rover Boys series, the boys are striding toward the conclusion of their school careers, a milestone they decide to celebrate with a grand tour. What will these quintessentially American lads think about the wider world? Find out in The Rover Boys on a Tour.