"Appendix E (9): Suggestions of Louis B. F. Raycroft", Second Annual Report of the Federal Radio Commission (year ending June 30, 1928), April 3, 1928, page 142: "7. Of the 90 American channels, after the twenty-eight-odd cleared channels have been deducted, there remain approximately 60, subject to further reduction as time goes on. These 60 channels are for the lower-powered nonexclusive services, which in the present state of the art can not be strictly heterodyne free, except in their local service areas."
"General Order No. 40" (August 30, 1928), Radio Service Bulletin, August 31, 1928, pages 9-10. The Davis Amendment was repealed in 1936.
"Federal Radio Commission order: July 27, 1928", Second Annual Report of the Federal Radio Commission (year ending 1928), page 152. One of the listed surrendered authorizations, Third Avenue Railway Co.'s WEBJ in New York City, had not been included on the May 25th list.
"Federal Radio Commission order: July 27, 1928", Second Annual Report of the Federal Radio Commission (year ending 1928), pages 151-152. One listed deleted station, KFIZ in Fond du Lac, Wisconsin, was ultimately relicensed.
