urn:nasa:pds:context:facility:laboratory.ttu-ag_eng 1.1 1.22.0.0 Product_Context 2025-01-07 1.1 Updated schema version. 2019-02-12 1.0 Initial creation of the context product. urn:nasa:pds:context:instrument:ttu-ag_eng.darwish_wt facility_to_instrument Darwish, M., (1991) Threshold Friction Velocity: Moisture and Particle Size Effects, MS Thesis, Dept. Agricultural Engineering, Texas Tech University. Texas Tech University, Department of Agricultural Engineering Laboratory Historically the Department of Agricultural Engineering c. 1991, at Texas Tech University, Lubbock. **No longer a stand-alone department, Agricultural Engineering is rolled into other programs at TTU. Likely places to contact: Texas Tech University Whitacre College of Engineering, Lubbock, TX http://www.depts.ttu.edu/coe/ or National Wind Institute, Texas Tech University, Lubbock, TX http://www.depts.ttu.edu/nwi/