In Jammer's book Concepts of Simultaneity on page 108, there is a reference to two of Poincaré's papers:
"...his 1904 lecture on St. Louis..."
"...his contribution to the Lorentz Festschrift."
Unfortunately there is no bibliography in the book, and an internet search does not reveal anything. How can I find a pdf of these papers?
PS: I am not sure if such bibliography type of questions are welcome here. But given the importance of the persons involved and the historical importance of the topic, I guess it can be tolerated.