(b) Records disclosure of which may be refused. Records need not (but may, as provided in
§ 4901.5(b)) be disclosed to the extent provided by -
(1) Paragraph (b)(2) of FOIA, dealing in general with internal agency personnel rules and practices;
(2) Paragraph (b)(4) of FOIA, dealing in general with trade secrets and commercial and financial information;
(3) Paragraph (b)(5) of FOIA, dealing in general with inter-agency and intra-agency memoranda and letters;
(4) Paragraph (b)(6) of FOIA, dealing in general with personnel, medical, and similar files;
(5) Paragraph (b)(7) of FOIA, dealing in general with records or information compiled for law enforcement purposes;
(6) Paragraph (b)(8) of FOIA, dealing in general with reports on financial institutions; or
(7) Paragraph (b)(9) of FOIA, dealing in general with information about wells.