Sure, you can get JPEGs or low-res versions from the LOC too, but, IMHO, they are not worth the trouble if you are going to enlarge them. For the best results, you need to work with uncompressed TIFF files which, for these photos, are in the 50MB range, and sometimes become five times that when you work on them in PS and eventually up-res them. One thing that does help, however, is that the TIFF files you get from the LOC are very high resolution to begin with.