The following is a special 9-part series published in POB from April 1999 to December 1999.

	State Plane Coordinates vs. Surface Coordinates, Part 1.
	State Plane Coordinates vs. Surface Coordinates, Part 2.
	State Plane Coordinates vs. Surface Coordinates, Part 3.
	State Plane Coordinates vs. Surface Coordinates, Part 4.
	State Plane Coordinates vs. Surface Coordinates, Part 5.
	State Plane Coordinates vs. Surface Coordinates, Part 6.
	State Plane Coordinates vs. Surface Coordinates, Part 7.
	State Plane Coordinates vs. Surface Coordinates, Part 8.
	State Plane Coordinates vs. Surface Coordinates, Part 9.