Springer has shared an Annual Performance Report for “Hypogene Karst Regions and Caves of the World”, a book edited by Klimchouk, A., N. Palmer, A., De Waele, J., Auler, A.S., and Audra, P., published in 2017:
According to this report, the number of chapter downloads in the past two years was:
In 2017 -- 21,532
In 2018 -- 19,719
Since online publication on Sep 11, 2017, there have been a total of 41251 chapter downloads.
The report also indicates that the book was among the top 25% most downloaded eBooks in the “Earth and Environmental Science” eBook Collection in 2018.