(a) Any contract for construction, alteration, or repair of public buildings or public works, including painting and decorating;

(b) Any work required to be done in accordance with the provisions of 41 U.S.C. chapter 65;

(c) Any contract for transporting freight or personnel by vessel, aircraft, bus, truck, express, railroad, or oil or gas pipeline where published tariff rates are in effect;

(d) Any contract for furnishing services by radio, telephone, or cable companies subject to the Communications Act of 1934;

(e) Any contract for public utility services;

(f) Any employment contract providing for direct services to a Federal agency by an individual or individuals; or

(g) Any contract for operating postal contract stations for the U.S. Postal Service.