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Robert Alan Dahl
Peter F Drucker
Dahl, Robert Alan;Dahl, Robert A.
Dahl R
R Dahl
Drucker, P F Miller, D C Dahl, R A
Peter Ferdinand Drucker

See also:

Dahl, Robert Alan
Drucker, Peter F.; Dahl, Robert A.; Miller, Delbert C.
Drucker, Peter Ferdinand, And D'Antonio, William