1. AMS technical manual. 67. Latitude functions, Hayford spheroid (international spheroid): Natural values of meridional arc A. B, C, D, E, and F factors, radii of curvature, Rand N; [Oct. 1944]. Bookmark Corporate/Agency Authors: Engineers Corps (Army) and Defense Dept. Publisher: Engineers Corps (Army) Date: 1944 [reprinted 1955] SuDoc number: W 7.33/2:67