CHOP has a Library Portal site which provides access to electronic resources and librarians to assist with research questions: CHOP Library | CHOP Research Institute 

CHOP employees, who are also faculty, students, or staff of the University, and have an active PennKey, have unrestricted access to all library resources and services. 

CHOP employees who are NOT affiliated with the University, might be eligible for a PennKey if they are actively involved in scholarly research. Visit this website to learn more and to request a PennKey:  CHOP PennKey Administration | CHOP Research Institute 

Any CHOP employee can gain physical access, during regular operating hours, to any Penn Library by showing a CHOP ID. Access and Visitor Information | Penn Libraries