South Dakota Codified Laws 7-1-40. Lake County boundaries
Beginning at the northeast corner of township one hundred eight north of range fifty–one west of the fifth principal meridian, thence west and along the second standard parallel north to the northwest corner of township one hundred eight north of range fifty–four; thence south and along the range line between ranges fifty–four and fifty–five to the southwest corner of township one hundred five north of range fifty–four west; thence east and along the first standard parallel north, to the southeast corner of township one hundred five north of range fifty–one west; thence north and along the range line between ranges fifty and fifty–one, to the place of beginning.
Source: SL 1872-3, ch 16, § 3; SL 1879, ch 12, § 8; SL 1879, ch 63; SDC 1939, § 12.0141.