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(a) watershed area in square kilometers (WsAreaSqKm); (b) natural logarithm of WsAreaSqKm; (c) percent of watershed area classified as developed, medium intensity land use in 2006 within a 100 meter buffer of a stream reach (PctUrbMd2006WsRp100); (d) natural logarithm of PctUrbMd2006WsRp100.
