(Catalog of 5,268 Standard Stars, 1950.0 Based on the Normal System N30)
(1950s catalog collecting proper motion data from older catalogs)
By N30 Catalog I refer to
Catalog of 5,268 Standard Stars, 1950.0 Based on the Normal System N30,
a catalog published in the 1950s incorporating proper motion
information derived from older catalogs.
It retains value for retrieving historical astrometric information.