Q. How do large groups get into the library without an Osprey 1Card?

Persons in a large group that do not have an Osprey 1Card will be vouched for by the group leader. The group  leaders will sign-in for their group, document how many people are in the group, and sign out when the group leaves. The members of the group who do have an Osprey 1Card can use it and do not need to be accounted for.