(原始内容存档于使用|archiveurl=需要含有|archivedate= (帮助)). Muir, John. Chapter 15, In the Sierra Foot-Hills. The Mountains of California. New York: Century Co. 1984 [2021-06-09]
ball was hoisted on the building's 70 foot flagpole with rope by a team of six men. The ball would begin to drop at 10 seconds before midnight, once it