I am doing a project for school (have to keep a record on stock prices). I have missed some stock prices, is there a way to backtrack the ones that are missed on different dates?

Follow the link to the prices for Amazon stock (care of Yahoo finance)...

http://finance.yahoo.com/q/hp?s=AMZN+His...

for future reference, just go to Yahoo Finance, enter Amazon in the "lookup" box on the left, hit return, then choose "historical prices" from the column on the left

I am doing a project for school (have to keep a record on stock prices). I have missed some stock prices, is there a way to backtrack the ones that are missed on different dates?