http://www.steinreport.com/BearStearnsStudy.pdf
In 2005 Bear Stearns cam up with 20 million illegal aliens. Its a well thought out study called “The Underground Labor Force is Rising to the Surface”
That could be the same study that I remember... a Wall Street house wanted to get an accurate count of illegals for one of their clients and knew that the “11 million” one trotted out by politicians was utter crap. The study put the number in the 20 millions.