Walt Bellamy has gotten the 25th most rebounds per game by a center in a season, with 19.0 per game in his rookie season in 1961-62.

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which center has the highest 25th highest rpg in a season
Interpreted as:
Which center has the highest 25th highest rpg with a minimum of 57.4 games played per 82 team games in a season?
1960-61Chamberlain1959-60Chamberlain1961-62Chamberlain1963-64Russell1965-66Chamberlain1962-63Chamberlain1966-67Chamberlain1964-65Russell1959-60Russell1960-61Russell1967-68Chamberlain1962-63Russell1961-62Russell1958-59Russell1964-65Chamberlain1965-66Russell1957-58Russell1963-64Chamberlain1966-67Thurmond1968-69Chamberlain1966-67Russell1968-69Thurmond1968-69Russell1971-72Chamberlain1961-62Bellamy27.227.025.724.724.624.324.224.124.023.923.823.623.623.022.922.822.722.321.321.121.019.719.319.219.0
NAMESEASONTMGPRPGMPGPPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Wilt ChamberlainWilt Chamberlain1960-61PHIPHI7927.247.838.41.915.831.150.96.713.350.43,7733,0332,149148130
Wilt ChamberlainWilt Chamberlain1959-60PHIPHI7227.046.437.62.314.832.146.18.013.858.23,3382,7071,941168150
Wilt ChamberlainWilt Chamberlain1961-62PHIPHI8025.748.550.42.420.039.550.610.417.061.33,8824,0292,052192123
Bill RussellBill Russell1963-64BOSBOS7824.744.615.04.76.013.843.33.05.555.03,4821,1681,930370190
Wilt ChamberlainWilt Chamberlain1965-66PHIPHI7924.647.333.55.213.625.254.06.312.451.33,7372,6491,943414171
Wilt ChamberlainWilt Chamberlain1962-63SFWSFW8024.347.644.83.418.334.652.88.313.959.33,8063,5861,946275136
Wilt ChamberlainWilt Chamberlain1966-67PHIPHI8124.245.524.17.89.714.268.34.810.844.13,6821,9561,957630143
Bill RussellBill Russell1964-65BOSBOS7824.144.414.15.35.512.643.83.15.557.33,4661,1021,878410204
Bill RussellBill Russell1959-60BOSBOS7424.042.518.23.77.516.146.73.25.361.23,1461,3501,778277210
Bill RussellBill Russell1960-61BOSBOS7823.944.316.93.46.816.042.63.36.055.03,4581,3221,868268155
Wilt ChamberlainWilt Chamberlain1967-68PHIPHI8223.846.824.38.610.016.859.54.311.438.03,8361,9921,952702160
Bill RussellBill Russell1962-63BOSBOS7823.644.916.84.56.615.243.23.76.655.53,5001,3091,843348189
Bill RussellBill Russell1961-62BOSBOS7623.645.218.94.57.616.645.73.86.359.53,4331,4361,790341207
Bill RussellBill Russell1958-59BOSBOS7023.042.616.73.26.514.245.73.76.159.82,9791,1681,612222161
Wilt ChamberlainWilt Chamberlain1964-65TOT7322.945.234.73.414.628.551.05.612.146.43,3012,5341,673250146
Bill RussellBill Russell1965-66BOSBOS7822.843.412.94.85.012.141.52.95.255.13,3861,0051,779371221
Bill RussellBill Russell1957-58BOSBOS6922.738.316.62.96.615.044.23.36.451.92,6401,1421,564202181
Wilt ChamberlainWilt Chamberlain1963-64SFWSFW8022.346.136.95.015.128.752.46.812.753.13,6892,9481,787403182
Nate ThurmondNate Thurmond1966-67SFWSFW6521.342.518.72.67.216.443.74.36.862.92,7611,2141,382166183
Wilt ChamberlainWilt Chamberlain1968-69LALLAL8121.145.320.54.57.913.658.34.710.644.63,6691,6641,712366142
Bill RussellBill Russell1966-67BOSBOS8121.040.713.35.84.910.745.43.55.861.03,2971,0751,700472258
Nate ThurmondNate Thurmond1968-69SFWSFW7119.745.221.53.68.019.641.05.48.761.53,2081,5241,402253171
Bill RussellBill Russell1968-69BOSBOS7719.342.79.94.93.68.443.32.65.052.63,2917621,484374231
Wilt ChamberlainWilt Chamberlain1971-72LALLAL8219.242.314.84.06.09.364.92.76.442.23,4691,2131,572329196
Walt BellamyWalt Bellamy1961-62CHICHI7919.042.331.62.712.323.751.96.910.864.43,3442,4951,500210281
StatMuse has season-level data for rebounds per game going back to the 1950-51 season.