During construction, the library is operating a temporary service desk in LL219. 

Service Desk Hours
 Monday - Thursday  9 am to 7 pm
 Friday  9 am to 5 pm
 Saturday  CLOSED
 Sunday  Noon to 8 pm

15 minutes before closing time all circulation transactions should be completed.

5 minutes before closing time library patrons should pick up belongings and move to the lobby. Doors close promptly at stated closing time.

The Columbia University Libraries website has a calendar view of the schedule above and hours for other libraries such as Barnard and the Digital Humanities Center.

Interlibrary Loan (ILL)

Monday - Friday, 9am to 5pm.

Archives & Special Collections

Monday - Friday, 9:15am to 4:45pm, by appointment only. Telephone and email reference is available Monday - Friday, 9am to 5pm. Please contact the Archives & Special Collections at hslarchives@columbia.edu for more information