metre
EPSG
"Geodesia y Cartografia Matematica" by Fernando Martin Asin; ISBN 84-398-0248-X.
1998-11-11
Original definition of semi-major axis given as 3272539 toise. In "Ellipsoidisch Parameter der Erdfigur (1800-1950)" , Strasser suggests a conversion factor of 1.94903631 which gives a=6378297.337 metres.