In the season records, Conference and Alliance Premier League teams are
indicated by a
A superscript. Southern League top division
teams (up to the foundation of the Conference North and South divisions
in 2004) are indicated by an
S superscript. Other non-league
teams are indicated by an
N superscript. The leagues these
teams participated in were as follows:
FA Cup 1892-93 Clifton Association Bristol & District League 1893-94 Warmley Bristol & District League 1894-95 Clifton Association Bristol & District League 1895-96 Bristol St George Western League 1896-97 Bedminster Western League 1898-99 Bristol Rovers Western League 1899-00 Wycombe Wanderers Southern League II 1899-00 Marlow Great Western Suburban League 1899-00 Chesham Town Southern League II 1911-12 Southall Southern League II 1911-12 Castleford Town Midland League 1911-12 Southport Central Central League 1924-25 Erith & Belvedere Kent League 1925-26 Leyton London League 1933-34 Sutton Town Derbyshire Senior League 1936-37 Ilford Isthmian League 1947-48 Bromley Athenian League 1957-58 Wisbech Town Midland League 1960-61 Kettering Town Southern League II 1963-64 Enfield Isthmian League 1966-67 Hendon II Isthmian League 1967-68 Dagenham Athenian League 1970-71 Bishop's Stortford Athenian League 1971-72 Bridgwater Town Western League 1971-72 Blyth Spartans Northern League 1972-73 Hayes Isthmian League 1973-74 Slough Town Isthmian League II 1975-76 Hendon II Isthmian League 1976-77 Wycombe Wanderers Isthmian League 1979-80 Barking Isthmian League 1982-83 Bishop's Stortford Isthmian League 1984-85 Barry Town Welsh League 1984-85 Bognor Regis Town Isthmian League 1988-89 Hendon II Isthmian League II 2000-01 Grays Athletic Isthmian League FA Amateur Cup 1894-95 South Bank Northern League
Other teams before 1894 were probably not members of a league. I couldn't track down Eastleigh LSWR (London and South Western Railway) (1895-96) or Oxford City, Chesham Generals and Richmond Association (all 1900-01). Corinthians, who Reading played in 1935-36, were a London-based amateur team existing outside the league structure.
Unless otherwise indicated, the team competed in the top level of the
given league. The roman numeral II denotes the second level. The
actual designation of these divisions - Premier Division, Division 1
or Division 2, along with regional sections - varies from league to
league and from period to period. For example, the history of the
top level of the Southern League is given in the description of the
S superscript. The
Club History Database is very useful for this sort of information.
The origins of some of the 19th Century teams is not always obvious from their name. Most were based in London, although Swifts (1880-81) were from Slough, Royal Engineers (1882-83) were from Chatham, Royal Artillery (1898-99) were from Portsmouth. South Bank (1894-95) is near Middlesbrough. Richmond Association (1900-01) were from Richmond upon Thames, not the one in Yorkshire. Sutton Town (1933-34) were from Sutton in Ashfield, in Nottinghamshire, and are now Ashfield United.
Also see here for information on team name changes.