Excerpts of the President's News Conference in Rapid City, South Dakota
PRESS: IS it your plan Labor Day to come to the office?
PRESIDENT: I think so. Yes. You see mail that is sent up here from Washington for me to look after would be here on Labor Day the same as any other day. Very likely I shall observe that, as I do other days, here in the office.
Source: "The Talkative President: The Off-the-Record Press Conferences of Calvin Coolidge". eds. Howard H. Quint & Robert H. Ferrell. The University Massachusetts Press. 1964.
Calvin Coolidge, Excerpts of the President's News Conference in Rapid City, South Dakota Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/349206