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The easiest way to find help is on the Libraries' website.
Use the Chat feature: this puts you immediately in direct contact with a chatter. However, there are limited hours, so if you are studying late someone might not be available. See Screenshot below.
Contact your Subject Specialist Librarian: You can call, email, or schedule a consultation without even talking to them! Check out the Subject Specialist Directory to find your Librarian. See Screenshot Below.