The International Telecommunication Union (ITU) has published the 2020 ITU Radio Regulations. It contains the texts of the Radio Regulations adopted during the World Radio-communication Conference 2019 (WRC-19). Available in different languages, the 2020 ITU Radio Regulations are in effect on January 1, 2021. Electronic versions are free and can be found here: https://www.itu.int/en/myitu/Publications/2020/09/02/14/23/Radio-Regulations-2020