I disputed some items on my credit report, I disputed them on experian and exquifax, at the time I did not have online access to transunion. Anyhow, I received a letter today from experian stating that the items have been deleted. My question is does this mean these items have been removed from all three reports or just the one? If only the one, then how do I go about getting them deleted from all three reports?

Just from the one, you have to dispute it on each, and each will make their own rulings

Yeah, Chuck is right. If you don't have online access then you will need to contact each credit bureau individually.