Yes, the handgun ban ended in 1984? and the University of Maryland study covered the period of the ban (1970 to 84?) It did note that rates increased after the ban ended.
The ban was in effect through 2007 before it was struck down by the Supreme Court.
Gun crime increased through the 90's despite the ban on guns due to Columbian drug cartels smuggling cocaine into the area.
And there's plenty of evidence from sources other than the NRa that show the ineffectiveness of the gun ban. I'll try and pull them up tomorrow when I'm at a computer.