The Elsevier encyclopedia series has one volume on Inland Waters with its first edition published in 2009. With 10+ years of new information, the writing of the second edition under the guidance of chief editors Thomas Mehner and Klement Trockner started in 2019 with expected publication in 2021. These encyclopedias are used around the world as a reference by teachers, managers and scientist. Rudstam is the editor for the “fundamental concepts and theories section. Activities in 2019 centered on identifying the chapter topics and authors for those chapters. Publication is expected in 2021.