The 1930 census is America 's best of 20th century , online it says . Actor Edward James Olmos calls it ` ` most important document '' There are 10 million Americans of Mexican descent . The entire 1930 Mexican census is now online for free .
The 1930 census is Mexico 's best of 20th century , online firm says . Actor Edward James Olmos calls census `` most important document '' There are 31.9 million Americans of Mexican descent . The entire 1930 Mexican census is now online for free .