The 
Summary
An open, digital collection that features full-text nursing research, educational, and evidence-based practice materials in a variety of formats and item types.
This service includes a broad variety of full-text nursing materials covering a variety of subjects, from conference posters to academic journal articles. This service is also used as the repository for the Sigma Theta Tau Honor Society of Nursing and includes slides and/or video of presentations given at past research events, congresses, and biennial conventions. The Sigma Repository is intended for use by anyone in the nursing field, but particularly by nursing students. Each item in the repository is authored or coauthored by a nurse or nursing student and can be directly accessed on the Sigma site. While these materials might be housed in additional places, this repository offers a unique window into nursing research that can be accessed and used freely. (Ref: A Review of Sigma Repository)