Freedom to Slaves!

This morning, while taking a break from report cards I decided to research the Emancipation Proclamation.  I found a very cool primary document I thought you'd all enjoy.  (Click on the image to enlarge it!)

In your comments please answer the following:   

1. What is a primary document?  
2. What is R.H. Milroy's perspective on the Emancipation Proclamation?  
3. How do you know?  Please cite the text using direct quotations from the text.