سیستم طبقه‌بندی متحد خاک (Persian Wikipedia)

Analysis of information sources in references of the Wikipedia article "سیستم طبقه‌بندی متحد خاک" in Persian language version.

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weebly.com

lauwtjunnji.weebly.com

D 2487 – 06: Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System) (PDF) (Technical report). ای‌اس‌تی‌ام بین‌الملل. 2006.

worldcat.org

Day, Robert W. (2013). Geotechnical engineer's portable handbook: with the 2012 international building code (2nd ed.). New York: McGraw-Hill. ISBN 978-0-07-178971-4. OCLC 837179787.