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by Hartley, William R.; Zimmerman, David J.
by Zimmerman, David R.; Mitchell, Michelle J.
by Zimmerman, Dale A.; Turner, Donald A.; Pearson, David J.
by Marquis, Jefferson P.; McNerney, Michael J.; Zimmerman, S. Rebecca; et al.
by Dale A. Zimmerman; David J. Pearson; Donald A. Turner
by Orley Ashenfelter (Princeton Univ.); Phillip B. Levine (Wellesley College); David J. Zimmerman (Williams College)
by Zimmerman, Dale A.; Turner, Donald A.; Pearson, David J.; et al.