If you grew up reading Andre Norton's 1970s YA fiction like Star Ka'at, then you'll want to cast back further into history and check out some of the novels from her Time Traders series, many of which are free online. Today, the resourceful nerds at BoingBoing linked to the third book in the Cold War series that pits time-traveling Soviets against time-traveling U.S. spies. The third book, The Defiant Agents, is about how a group of Apache natives colonize space (yay for getting to be the colonizers this time around?), but the first book (Time Traders) sets the scene by giving us a 1950s-style temporal arms race between the commies and the capitalist pigdogs. Download them both and while away a couple of afternoons.