Full Christmas album from Milwaukee Lutheran High School, located in Milwaukee, WI, from local label Delta Records. Like most of Delta's work, there is no known year, but going by the hairstyles and overall feel of the album, I'd say late '60s or early '70s, as most of these records seemingly came out around then.
UPDATE: I did some digging and found another \"Carols of Christmas\" album, done by the Academy of Notre Dame, and someone (who I'm assuming is an alumni) mentioned that the release year is 1967 (see here: http://www.marilynkinsella.org/Notre Dame/carols_of_christmas album 1967.htm). I'm assuming that the albums had a yearly theme, so this could very well be the release year.
This was one of many LPs I thrifted recently. Of course, I'll be posting them all here.