Date of update: 16 May 1995 List of ITU-T Series A Recommendations in force ** - Series B * Means of expression B.1 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Letter symbols for telecommunications B.3 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Use of the international system of units (SI) B.10 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Graphical symbols and rules for the preparation of documentation in telecommunications B.11 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Legal time - use of the term UTc B.12 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Use of the decibel and the neper in telecommunications B.13 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Terms and definitions B.14 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Terms and symbols for information quantities in telecommunications B.15 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Nomenclature of the frequency and wavelength bands used in telecommunications B.16 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Use of certain terms linked with physical quantities B.17 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Adoption of the CCITT Specification and description Language (SDL) B.18 (1993) [Rev.1] [1 pp.] [Publ.: Dec.93] Traffic intensity unit B.19 (1988) [Blue Book Fasc. I.3] [Publ.: Jul.91] Abbreviations and initials used in telecommunications ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. They are included in fascicles and volumes of the Blue Book that may still be purchased from the ITU Sales Service. Since the beginning of the 1988-1993 Study Period ("post Blue Book") ITU-T Recommendations are published and offered for sale individually (in separate fascicles). 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