The photographs on these pages are reproduced courtesy of the United States Library of Congress, and were taken in US Government Printing Offices in Washington, DC.

Just catalogued as Government printing offices presses. I would guess the photo was taken before World War 2.

Scant details again on this one, but accurately dated by the photographer as 1904. Very distinctive looking presses, with large handles.
A small selection of Letterpress Ebay listings appear below. A much bigger selection appears here. Linotype-related Ebay listings are here.