Jessica Hsu ’10 (left) and Eileen Zerba, director of undergraduate laboratories in the Princeton Environmental Institute, at work on one of Butler College’s green roofs.
Denise Applewhite

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Jessica Hsu ’10 (left) and Eileen Zerba, director of undergraduate laboratories in the Princeton Environmental Institute, at work on one of Butler College’s green roofs.
Jessica Hsu ’10 (left) and Eileen Zerba, director of undergraduate laboratories in the Princeton Environmental Institute, at work on one of Butler College’s green roofs.
Denise Applewhite