I have quite a few old postcards that came along with my stamp collection and the majority I can figure out. The exception is this mini album of postcards from lourdes complete and unused. Not sure what date this could possibly be and have no idea of valuations on postcards.
Since I set eyes on it, I have loved that church. My guess is there were published in the first or second decade of the 20th century, probably not long after the establishment of the Feast of Our Lady of Lourdes in 1907.
I'm guessing value would be very based on the right place right time scenario. Some of the B&W ones I have from canada make me wonder why they would even take the pic. Have a few from edmunston NB that just don't have any appeal. Might be at that time there wasn't anything better to take pics of.