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The Bulletin is the "authoratative instrument" of the Commissioner of Internal Revenue. As one can see from the four sections delineated above that official rulings, court decisions, Executive Orders, legislation and other general interest items are announced through the Bulletin.
The Bulletin can be accessed on line at: http://www.irs.gov/app/picklist/list/internalRevenueBulletins.html
The State Library holds an extensive cdollection of this material starting in 1921.
The Reference Dept.