"E. Require Surrender of Licenses by Dual Expanded Band/Standard Band Licenses"Federal Communications Commission: First Report and Order, Further Notice of Proposed Rule Making, and Notice of Inquiry, MB Docket No. 13-249, Adopted October 21, 2015, Released October 23, 2015, footnote #198, pages 32-33 (Appendix F, pages 67-69, lists 25 cases where co-owned original and expanded band stations were still operating. Two additional assignments are unlisted: 630/1640 in Sandy, Utah, and 1090/1690 in Charlotte Amalie, U.S. Virgin Islands.) (FCC.gov)
"Fourth Notice of Inquiry" (FCC 88-72. Adopted February 25, 1988, released June 3, 1988), page 4511 (footnote no. 15).
"Travelers Information Stations" (paragraph 24), Memorandum Opinion and Order, Docket No. 87-267, FCC 93-196, filed May 11, 1993, effective date June 11, 1993.
"IV. Migration to the Expanded Band", Review of the Technical Criteria for the AM Broadcast Service (FCC MM Docket No. 87-267. Adopted September 26, 1991 and released October 25, 1991), pages 6302-6323.