I am slowly uploading my collection of vintage photos and snapshots to Flickr. I am also trying to upload bigger photos as I think some of the ones I did at first may be too small to print.
To get to the printable size, from Flickr, click on the photo, under the title in the middle you will see "all sizes" --> click on original and that will give you the big size.
Usage terms - please feel free to use these in art you create, even art for sale. Please do NOT redistribute as is for commercial purposes, including rubber stamps, collage sheets, and image collections.