How to Find Your Employment History
It can be hard, especially if you have had a lot of jobs, to keep track of your personal employment history. However, when applying for jobs companies want an accurate record of where and when your worked.
So, what can you do when you don't remember your exact dates of employment? Here's how you can compile your personal employment history when you have forgotten or are missing some of the details. Source: Alison Doyle, About.com Job Searching