Reddit mentions of Petrushka in Full Score: Original Version (Dover Music Scores)

There are a lot of courses. Any specific topics you're interested in?

Edit: I'll just list a few anyway that I've used in classes (this may not reflect all professors' choices for the same subjects).

Tonal Harmony: Kostka-Payne - Tonal Harmony

Counterpoint 1: A Berklee book by the late professor Rick Applin. Some also use this Fux translation/adaptation

Counterpoint 2: Bach Inventions & Sinfonias (any edition, really)

"Advanced" Counterpoint: The Well-Tempered Clavier (again, any edition)

Early Twentieth-Century Harmony: Persichetti - Twentieth-Century Harmony

Post-Tonal Theory/Analysis: Straus - Intro to Post-Tonal Theory

Instrumentation/Orchestration: Adler - The Study of Orchestration &
Casella/Mortari - The Technique of Contemporary Orchestration

Western Music History - Burkholder/Paiisca - A History of Western Music (8th or 9th edition)

Conducting 1 - Notion Conducting

Conducting 2 Notion + Stravinsky's Petrushka

Berklee's own (jazz-based) core harmony and ear-training curricula use Berklee textbooks written by professors which, as someone else mentioned, come unbound and shrink-wrapped at the bookstore. You can find older (PDF) versions of the Berklee harmony textbooks here. Of course this list only represents explicit book choices - there are a lot of excerpt-readings, and there's a lot of instruction that isn't found in these books even in the associated courses.