What's the Difference?

[The1337Magician]

How can you tell the difference between Alpha, Beta, and Revised due to none having expansion symbols. Is it by the text at the end?

[Dudecore]

Alpha: Black Bordered, edges more rounded
Beta: Black Bordered, edges more sharp (normal) corners
Unlimited: White Bordered, double line around the border
Revised: White Bordered, single line around the border

[Dudecore]

Additional information: http://www.abugames.com/Magic_the_Gathering_Edition_Guide.html