TY - BOOK PB - U.S. Dept. of Commerce, National Telecommunications and Information Administration ; For sale by the National Technical Information Service TI - Spectrum required for HF broadcasting [microform] / James Washburn ... [et al.] T3 - NTIA report ; 90-268. KW - Shortwave radio -- Transmitters and transmission. A2 - Washburn, J. S. (James S.) A2 - United States. National Telecommunications and Information Administration CY - [Boulder, CO] : Springfield, VA N1 - Distributed to depository libraries in microfiche. N1 - "October 1990." N1 - Includes bibliographical references (p. 33). N1 - VOA/EOF. 1-910-5513. PY - 1990 M1 - Accessed from https://nla.gov.au/nla.cat-vn4055574 ER -