TY  - BOOK
AU  - Levin, Harvey J
TI  - The invisible resource: use and regulation of the radio spectrum 
SN  - 0801813166
U1  - 621.3841 
PY  - 1971///
CY  - London
PB  - The Johns Hopkins Press
KW  - Radio frequency allocation--United States
KW  - Radio--Law and legislation--United States
N1  - Includes bibliographical references and index
ER  -