A deeply personal collection of love letters a smitten Bob Dylan wrote to his high-school sweetheart in the late 1950s is up for auction. Boston-based RR Auction says the 42 letters totaling 150 pages were written to Barbara Ann Hewitt between 1957 and 1959 by a Hibbing, Minnesota, teenager still known then as Bob Zimmerman. They pour light on a period in the folk-rock icon’s life for which not much firsthand information is available. The auction runs until Nov. 17. In the missives, Dylan foresees changing his name and selling a million records.