Time Traders #1
A book with 3 separate short stories all tied together by common characters. Basically, humanity finds the ability to time travel and the Americans are going through history trying to find the Russians, who seem to have found some advanced tech way in the past. Turns out it was from an alien spaceship. The russians get all their bases destroyed and the americans start tiptoeing.
Ends with a group of americans finding an intact spaceship and making a trip to the aliens world. The alien empire seems to have fallen and humanity looks to have a free hand.
I really enjoyed this. Norton writes in the classic scifi style and it was nice to have some straight forward adventure stories without all the psychological baggage.