Columbia University [Women carrying a stack of books down a flight of stairs.]

Columbia University [Women carrying a stack of books down a flight of stairs.]

Columbia University [Student carrying books down a flight of stairs.]

Columbia University [Student carrying a stack of books down stairs.]

Columbia University [Student carrying a stack of books down stairs.]

Columbia University [Student carrying a stack of books down stairs.]

Columbia University [Woman carrying a large stack of books down stairs.]

Columbia University [Women carrying large stack of books down stairs.]

Columbia University [Woman with a large stack of books walking down a flight of stairs.]

Columbia University [Woman with a large stack of books walking down a flight of stairs.]

Columbia University [Woman with a large stack of books walking down a flight of stairs.]

Columbia University [Man holding a large box.]

Columbia University [Man holding a large box.]

Columbia University [Woman with a large stack of books walking down a flight of stairs.]

Columbia University [Man in a dining room.]

Columbia University [Man holding a bright light.]

Columbia University [Students talking on a stairway.]

Columbia University [Students talking in a stairway.]

Columbia University [Man smoking.]

Columbia University [Man welding.]