Although it's now yet listed on the National Archives web site, the 1930 Federal Population Census microfilm catalog is now available. Copies are $3.50 each plus shipping. For details on ordering by phone or mail, shipping charges, etc., see www.nara.gov/publications/order.html . If you don't know what this is, you're missing out! This is a book that gives you the cross-reference numbers between locations, enumeration districts, and NARA microfilm reel numbers...speeds up your research significantly.