To JWN's point about how difficult this is to narrow to 50....
Last time this was done (1965-1994 30 Years) they went 3-deep at each position which gets you 70+ players.
http://www.niuhuskies.com/sports/m-footb...-team.html
Pos Player (Years Lettered)
WR Dave Petzke (1977, 1978)
Willie Hatter (1970, 1971, 1972)
Carl Aikens (1981, 1983, 1984)
WR John Spilis (1966, 1967, 1968)
Curt Pardridge (1982, 1983, 1984, 1985)
Larry Wynn (1989, 1990, 1991, 1992)
TE Brian Glasgow (1979, 1980, 1981, 1982)
Reggie Sims (1981, 1982, 1983, 1984)
Jim Latanski (1977, 1978, 1979, 1980)
OT Scott Bolzan (1980, 1981, 1982, 1983)
Dan Rosado (1977, 1978, 1979)
Todd Peat (1983, 1984, 1985, 1986)
OT Randy Clark (1977, 1978, 1979)
Dave Weisendanger (1968, 1969, 1970)
Jim Hannula (1977, 1978, 1979, 1980)
OG Ted Karamanos (1984, 1985, 1986, 1987)
Mike Chelovich (1978, 1979, 1980, 1981)
Randy Shelton (1976, 1977)
OG Todd Peat (1983, 1984, 1985, 1986)
Rich Barrent (1979, 1980, 1981, 1982)
Tim Holt (1971, 1972)
C Eric Wenckowski (1988, 1989, 1990)
Randy Clark (1977, 1978, 1979)
Dan Graham (1984, 1985, 1986, 1987)
QB Stacey Robinson (1989, 1990)
Tim Tyrrell (1982, 1983)
Jerry Golsteyn (1973, 1974, 1975)
FB Mark Kellar (1971, 1972, 1973)
Adam Dach (1988, 1989, 1990, 1991)
John Lalonde (1968, 1969, 1970)
RB LeShon Johnson (1992, 1993)
Allen Ross (1977, 1978, 1979, 1980)
Jerry Latin (1972, 1973)
PK Vince Scott (1980, 1981, 1982, 1983)
John Ivanic (1987, 1988, 1989, 1990)
Tom Wittum (1969, 1970, 1971)
KORet Byron Florence (1971, 1972, 1973)
Mike Pinckney (1979, 1980)
Rodney Taylor (1985, 1986, 1987, 1988
DEFENSE
Pos. Player (Years Lettered)
DL Scott Kellar (1982, 1983, 1984, 1985)
Steve O'Malley (1982, 1983, 1984, 1985)
Ken Moore (1974, 1975, 1976)
DL Doug Bartlett (1983, 1984, 1985, 1986)
Ted Hennings (1986, 1987, 1988, 1989)
Cary Caliendo (1987, 1988, 1989, 1990)
DL Max Gill (1979, 1980, 1981, 1982)
Scott Van Bellinger (1988, 1989, 1990, 1991)
Reggie Harris (1984, 1985, 1986, 1987)
DL Jerry Meyers (1973, 1974, 1975)
Tom Rosenow (1965, 1966, 1967)
Steve Claussen (1976, 1977, 1978, 1979)
LB Frank Lewandoski (1976, 1977, 1978, 1979)
Mike Terna (1977, 1978, 1979, 1980)
Jim Faggetti (1966, 1967, 1968)
LB Larry Clark (1970, 1971, 1972)
Ron Delisi (1986, 1987, 1988, 1989)
Tim Griffin (1982, 1983, 1984, 1985)
LB Bob Gregolunas (1973, 1974, 1975)
Larry Alleyne (1979, 1980, 1981, 1982)
Gerald Nickelberry (1991, 1992, 1993, 1994)
DB Dave Petway (1977, 1978, 1979, 1980)
Kevin Cassidy (1987, 1988, 1989, 1990)
Lee Hicks (1981, 1982, 1983, 1984)
DB Brett Tucker (1985, 1987, 1988, 1989)
Steve Hirsch (1980, 1981, 1982, 1983)
Jeff Taylor (1990, 1991, 1992)
DB Jeff Sanders (1982, 1983)
Dan Meyer (1964, 1965, 1966)
Dan DeVito (1968, 1969, 1970)
DB Rich Marks (1971, 1972, 1973)
Mark Stuart (1977, 1978)
Mike Hollingshed (1984, 1985, 1986, 1988)
P Tom Wittum (1969, 1970, 1971)
Todd Van Keppel (1981, 1982, 1983, 1984)
Jim Hannula (1977, 1978, 1979, 1980)
PRet Rodney Taylor (1985, 1986, 1987, 1988)
Chris Blake (1971, 1972, 1973)
Jeff Sanders (1982, 1983)