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Standard Methods for the Examination of Water and Wastewater, 23RD Edition
[http://4mechengineer.com/standard-methods-for-the-examination-of-water-and-wastewater-23rd-edition/] - - public:bttgcm
Stone as a traditional building material - Practical Answers
[https://answers.practicalaction.org/our-resources/collection/stone-construction-1] - - public:bttgcm