Heading is initialism of an author whose real name is not known
Names
HeadingS. X. used in: British Library: English Short Title Catalogue - AACR2 Heading, London (United Kingdom); British Library: English Short Title Catalogue - GK Heading, London (United Kingdom)
Variant NameS.X.
X., S.
Sources
Imprint SourcesT062789: his A letter concerning prerogative, 1755 end sg= S- X-