I know a book exsits that contains hundreds of floor plans of houses
from the 1920's and 1930's. It may be a government issed book. I have
looked at tons of places and I can't find it, maybe you can direct me.

I have not been able to locate a US Government publication on this
subject, and I haven't found a book that has "hundreds of floor
plans," but these books might be of interest to you:

"The Modern House Today," by Nick Dawe and Kenneth Powell, contains
floor plans of fifteen "streamline" houses of the 1930s, and photos of
an additional fifty houses.

http://www.amazon.com/exec/obidos/ASIN/1901033724/qid=1028228253/sr=1-1/ref=sr_1_1/103-2217363-6389430

"Classic Modern Homes of the Thirties: 64 Designs by Neutra, Gropius,
Breuer, Stone and Others (Modern House in America), by James Ford and
Katherine Morrow Ford, is a reprint of a book first published in 1940.
It contains photos and detailed floor plans of 62 houses.

http://www.amazon.com/exec/obidos/ASIN/0486259277/qid%3D1028228413/sr%3D11-1/ref%3Dsr%5F11%5F1/103-2217363-6389430

I found the following book, it was originally published in 1925 and
was reprinted in 2001:

Distinctive house design and decor of the twenties : 
                          with over 500 floor plans and illustrations
/
                          Richardson Little Wright
                          2001, 1925 
                          English  Book 191 p. : ill. ; 31 cm. 
                          Mineola, N.Y. : Dover Publications, ISBN:
0486418251 (pbk.)

It is available on amazon.com:

http://www.amazon.com/exec/obidos/ASIN/0486418251/qid=1028409844/sr=8-1/ref=sr_8_1/002-2419997-5844833