How do I find the variable named STDTRACT in the 1940 Census 1%? A release from IPUMS claimed it is available.

The detailed geographical variables including STDTRACT that recently became public use are mentioned in the April 30, 2013 section of revisions, listed here:

but when I look through the variables available for selection in the 1940 1% sample Census IPUMS U can’t find it. Any help is very much appreciated. Thanks.

STDTRACT had been inadvertently removed from the website. It is now present again, under Household–>Historical Technical. I sincerely apologize for any inconvenience that this caused.