February 2, 2018 First Circular for the 21st International Workshop on Laser Ranging Released 02/02/2018 The Space Environment Research Centre (SERC) and the International Laser Ranging Service (ILRS) are pleased to announce that the 21st International Workshop on Laser Ranging will be held in Canberra, Australia during the week of November 04-09, 2018 at the John Curtin School of Medical Research (Australian National University) and Mount Stromlo. The first circular has been released. Link https://ilrs.cddis.eosdis.nasa.gov/docs/2018/IWLR21_FirstCircular_201811.pdf