Abt (1977)         1977PASP...89...29A
Abt (1981)         1981ApJS...45..437A Cat. III/106
Abt (1984)         1984ApJ...285..247A
Abt (1985)         1985ApJS...59...95A Cat. J/ApJS/59/95
Abt (1986)         1986ApJ...309..260A
Appenzeller (1967) 1967PASP...79..102A
Arellano (1986)    1986ApJ...302..767A
Bahng (1958)       1958ApJ...128..572B
Batten (1989)      1989PDAO...17....1B Cat. V/64
Beavers (1982)     1982ApJS...49..273B
Bertaud (1970)     1970A&AS....1....7B
Bidelman (1954)    1954ApJS....1..175B
Bidelman (1957a)   1957PASP...69..147B
Bidelman (1957b)   1957PASP...69..326B
Bidelman (1958)    1958PASP...70..168B
Bidelman (1988)    1988PASP..100.1084B
Burki (1983)       1983A&A...124..256B
Cat. HD                                Cat. III/135
Corbally (1984)    1984ApJS...55..657C Cat. III/117
Cowley (1969)      1969AJ.....74..375C
Cowley (1971)      1971PASP...83..296C
Cowley (1976)      1976PASP...88...95C
Cowley (1979)      1979PASP...91...83C
Edwards (1976)     1976AJ.....81..245E
Evans (1979)       1979ApJ...228..497E
Griffin (1976)     1976Obs....96..153G
Griffin (1988)     1988JApA....9..193G
Griffin (1989)     1989JApA...10..433G
Griffin (1990)     1990JApA...11..281G
Griffin (1992)     1992A&A...254..289G
Griffin (1994)     1994MNRAS.270..409G
Harlan (1974)      1974AJ.....79..682H Cat. III/171
Harmer (1983)      1983MNRAS.204..927H
Heard (1956)       1956PDDO....2..105H
Hendry (1978)      1978AJ.....83..615H
Hendry (1981)      1981AJ.....86..271H
Hoffleit (1982)                        Cat. V/50
Houk (1982)                            Cat. III/80
Houk (1988)                            Cat. III/133
Hynek (1959)       1959PASP...71..310H
Jaschek (1991)     1991A&A...252..229J
Keenan (1989)                          Cat. III/150
Kuhi (1963)        1963PASP...75..448K
Malaroda (1973)    1973PASP...85..328M
Malaroda (1975)    1975AJ.....80..637M
Markowitz (1969)                       Ph.D thesis, Ohio State Univ.
McAlister (1982)   1982AJ.....87..563M
Meisel (1968)      1968AJ.....73..350M
Moore (1950)       1950ApJ...112...48M
Olsen (1980)       1980A&AS...39..205O
Roman (1949)       1949ApJ...110..205R
Sato (1990)        1990A&AS...85.1069S cat. V/69
Slettebak (1955)   1955ApJ...121..653S
Slettebak (1969)   1969AJ.....74..373S
Stebbins (1956)    1956ApJ...123..440S
Stephenson (1960)  1960AJ.....65...60S
Stephenson (1969)  1969AJ.....74..689S
Stickland (1988)   1988IUE88...2...27S
Strassmeier (1990) 1990A&A...230..389S
Underhiller (1990) 1990A&A...230..389S
Underhill (1954)   1954AJ.....59..332U
Walker (1966)      1966Obs....86..154W
Wellmann (1951)    1951AN....279..257W
Wright (1970)      1970VA.....12..147W