Background and history:  During a Town Hall at the AGU Fall Meeting in December 2020 the challenge of complex data citations was identified as an urgent concern within the Earth, space, and environmental sciences.    This working group addresses the use case of citing a large number of existing objects (e.g., datasets, software, or physical samples) in a way that allows credit for individual objects to be properly assigned. Such collections of objects may contain hundreds to millions+ of elements, and the ‘complex’ citation might...