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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