Wikipedia contributors. (2024, April 15). Voyager Golden Record. In Wikipedia, The Free Encyclopedia. Retrieved April 29, 2024, from https://en.wikipedia.org/w/index.php?title=Voyager_Golden_Record&oldid=1219097591
Highline College erratic. Granitic with “textbook en echelon dikes”. 21 by 12 feet (6.4 m × 3.7 m) and 9 feet (2.7 m) high.