----------------------------Original message---------------------------- ------------------- Jan Smits WWW site, Mathematical Data for Bibliographical Descriptions, http://www.konbib.nl/kb/skd/skd/mathemat.htm, includes a table of the locations of prime meridians. The table is derived from sources which include =5FCartographic materials : a manual of interpretation for AACR2=5F. According to this table, the Washington (D.C.) meridian is W = 077=BA00=B434=22. Pat Fell