TY - BOOK AU - Piggott, W. R. AU - Rawer, K. TI - URSI HANDBOOK OF IONOGRAM INTERPRETATION AD REDUCTION U1 - 538.761 PY - 1961/// CY - Amsterdam PB - Elsevier Pub. Co. KW - Ionospheric Radio Wave Propagation -- Observations KW - Ionospheric Research N1 - Reference Materials And Facilities ER -