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

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

Columbia University [Woman carrying a large 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 [Student carrying a 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 [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 [Students talking on a staircase.]

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

Columbia University [Students talking on a staircase.]

Columbia University [Students talking on a staircase.]

Columbia University [Group of men studying.]

Columbia University [Students studying.]

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

Columbia University [Woman diving.]

Columbia University [Woman diving.]