Engineering calculations [https://www.cecalc.com/CivilandStructuralCalcs.aspx] - 2019-04-29 14:19:00 - public:bttgcm calculators, engineering, hydraulics, structural - 4 | id:244370 -
________ [https://www.lenntech.com/calculators/calculators.htm] - 2018-12-06 14:32:38 - public:bttgcm calculators, engineering, environmental, water - 4 | id:229101 -
