The directory provides comprehensive information on the agencies of the legislative, judicial, and executive branches, as well as quasi-official agencies, international organizations in which the United States participates, boards, commissions, and committees. 
Each agency's description consists of the following:
-- List of principal officials
--Summary statement of the agency's purpose and role in the Federal Government
--Brief history of the agency, including its legislative and executive authority
--Description of consumer activities, contracts and grants, employment, and publications

United States Government Manual 2006/2007

Reference

NARA

Almanacs & Yearbooks

Bernan Assoc

Directory of the government structure of the United States of America. A special feature of this premium publication is the Source of Information section that lists addresses and telephone numbers for each agency identifying contacts for employment, Government contracts, publications, films, and other services available to the public.

The United States Government Manual 2007/2008 (Public Papers)

The Code of Federal Regulations is a codification of the general and permanent rules published in the Federal Register by the Executive departments and agencies of the United States Federal Government.

Code of Federal Regulations, Title 29, Labor: Pt. 1900, Section 1910.999: Revised as of July 1, 2008

Business

National Archives and Records Administrations

As the official handbook of the Federal Government, The United States Government Manual provides information on the agencies of the legislative, judicial, and executive branches. It also includes information on quasi-official agencies; international organizations in which the United States participates; and boards, commissions, and committees.

United States Government Manual 2017

Claitor's Pub Division

Code of Federal Regulations Title 29 Labor Parts 1926 2016

Code of Federal Regulations Title 29, Labor, Parts 1926, 2016

Administrative Law

Code of Federal Regulations, Title 14, Aeronautics and Space, Parts 1-59, 2017

Code of Federal Regulations Title 15, Commerce and Foreign Trade, Parts 0-299, 2017

Code of Federal Regulations Title 21, Food and Drugs, Parts 1-99, 2017

Code of Federal Regulations Title 21, Food and Drugs, Parts 170-199, 2017

Code of Federal Regulations Title 21, Food and Drugs, Parts 800-1299, 2017

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