To ensure the currency and relevancy of the assignment guides, we go through the guides at the end of each major term (fall, spring, summer) and unpublish any assignment guides that were last requested more than 3 semesters earlier. I.e. now at the end of fall 2020, we're leaving up guides from summer 2020, spring 2020, and fall 2019, but guides from summer 2019, spring 2019, or older will be unpublished.
But I still use that assignment!
Okay, awesome! Just send an email to uplibrary-ref@lonestar.edu (or directly to elaine.m.patton@lonestar.edu) to let us know you're still using both that same assignment and the associated guide. Let us know if you've made any changes to the assignment, and/or send us a fresh copy of the assignment to include. We'll tag the article with the current semester and start the clock over on it.
Be forewarned, though, we're probably going to give you a nudge in return about reincorporating a live librarian workshop with your class! :) Nearly all the assignment guides were created to accompany a librarian-led instruction session. It's not strictly a requirement, but we do of course have rather strong feelings about the value of those sessions: not only to introduce your students to the databases or citations or what-have-you, but also just to develop relationships and become a slightly-more-familiar face to the students. You can sing our praises all you want in class and in the syllabus, but most students aren't going to "hear" you and make the time to come talk to us. Also, library anxiety is a very real phenomenon -- students are intimidated by the library!