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

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

Columbia University [Man carrying a box down stairs.]

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

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

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

Columbia University [Two women looking through books.]

Columbia University [Two women looking through books.]

Columbia University [Women cooking in a kitchen.]

Columbia University [Students talking in a stairway.]

Columbia University [Students talking on a stairway.]

Columbia University [Students talking in a stairway.]