Rypkema et al, 2007, Rapid, In-Stride Soil Phosphate Measurement in Archaeological Survey: A New Method Tested in Loudoun County, Virginia
Reference
Rypkema, H.,
Lee, W. E.,
Galaty, M. L.,
&
Haws, J. A.
Rapid, In-Stride Soil Phosphate Measurement in Archaeological Survey: A New Method Tested in Loudoun County, Virginia. Journal of Archaeological Science, 34: 1859-1867. (2007).

