Question about telling chicks apart

[Amyh]

My local feed store is getting a shipment of chicks next week of several breeds. I want to get some White Rocks and some Silver Laced Wyandottes. How can I tell which chicks they are? Is there something I should look for? I've looked at images, but just wanted to see if there are any certain things that will help me differentiate the chicks I want with the group.

They will also have Buff Orpingtons, Golden Laced Wyandottes, and Barred Rocks. Also several others I can't remember...

 

[Higins00]

They usually have them separated so you can tell, at least my store does. Bring a picture with you so you can compare because if they are all together you are going to draw a blank on what your looking for.