{"id":"schaefer2020picture","DOI":"10.3724/sp.j.1440-2807.2020.03.01","URL":"https://doi.org/10.3724/sp.j.1440-2807.2020.03.01","type":"article-journal","title":"A Case Study of the Picture Rocks Sun Dagger, Plus a Review of the Intentionality of Sun Daggers","author":[{"given":"Bradley E.","family":"Schaefer"},{"given":"James","family":"Stamm"}],"issued":{"date-parts":[[2020]]},"year-text":"2020","container-title":"Journal of Astronomical History and Heritage 23(3): 427-451","catalog-key":"SRC0D9KTCE25TNP"}