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This is to certify that your paper entitled «Laboratory study of geotechnical parameters of lead contaminated CL soils in Najmabad industrial towns located in Alborz province» was indexed with 8 pages, in the CIVILICA citation database, code COI:CIVILISC02_049, after evaluation and approval of the referees of the "The Second International Conference on Research Findings in Civil Engineering, Architecture and Urban Planning held in Tehran 2022.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.