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https://app.knovel.com/hotlink/toc/id:kpEG000002/engineering-geology/engineering-geology
Norbury, David. (2016). Soil and Rock Description in Engineering Practice (2nd Edition). Whittles Publishing. Online version available at:
https://app.knovel.com/hotlink/toc/id:kpSRDEPE07/soil-rock-description/soil-rock-description