Dan,
I stole it from another Forum, posted by another guy from Michigan.
This article was published in 1957 in a Michigan State Police monthly publication entitled, "POST-ER".

Original Post:
Post war use for folding stock .30 carbine - M1 SERIES OF CARBINES [REF] - U.S. Militaria Forum

My copy cat post:
http://www.milsurps.com/showthread.php?t=35245

When time allows I'll try to search the local area for any links to the publication.