by the National Weather Service, Aviation Weather: For Pilots and Flight Operations Personnel… (1975)
“ A companion manual, Aviation Weather Services, Advisory Circular 00-45, supplements Aviation Weather. This supplement (AC 00-45) periodically is updated to reflect changes brought about by latest techniques, capabilities, and service demands. It explains current weather services and the formats and uses of weather charts and printed weather messages. The two manuals are sold separately; so at a nominal cost, a pilot can purchase a copy of the supplement (AC 00-45) periodically and keep current in aviation weather services. ”
