ABERDEEN, S.D. (AP) - Some of the pipe for the Trans-Canada Keystone oil pipeline is in the ground in Marshall County in northeast South Dakota.

The buried pipeline eventually will carry crude oil from Canada through 10 counties in eastern South Dakota and on to refineries in Illinois and Oklahoma.

TransCanada spokesman Jeff Raugh says work in northeast South Dakota will continue through most of November and possibly into December.

Meanwhile, crews are preparing to get the pipeline across the Missouri River at Yankton by drilling beneath the river and pulling pipe through.

Raugh said the permit process was sophisticated and involved a number of federal agencies, including the National Park Service because that part of the river is classified a Wild and Scenic River.