As of my last knowledge update in January 2022, I don't have specific information about a resource named "Upper Secondary Essay Library." However, the term suggests a collection of essays designed for students in the upper secondary level, typically aged 16-18.

A possible description for an "Upper Secondary Essay Library" could be:

"The Upper Secondary Essay Library is a comprehensive collection of essays tailored for students in the upper secondary level. This resource is curated to provide a diverse range of essay examples covering various subjects, themes, and writing styles. Aimed at enhancing students' writing skills, critical thinking, and analytical abilities, the library serves as a valuable tool for educators and students seeking inspiration and guidance for essay writing assignments. The essays within the library may span different genres, including persuasive, expository, narrative, and argumentative writing, offering a rich source of examples to aid in academic and creative writing endeavors."