I don't have an atlas and I need help finding the location. I need the nearest city and the country that it's in. Thank you.

1. 31° s, 64° w
2. 13° s,71° w
3. 16° s, 68° w

Put each into www.google.com.

Here's what I got when I entered the first set of numbers:
http://www.google.com/search?q=31%C2%B0+s%2C+64%C2%B0+w&rlz=1C1GGGE_enUS379US379&oq=31%C2%B0+s%2C+64%C2%B0+w&aqs=chrome.0.57j62l3.1791&sugexp=chrome,mod=1&sourceid=chrome&ie=UTF-8