The lyrics from the Weavers are the same as those used by the Brothers Four, from "Sing of our Times"(1966?), which is still available from Amazon, with song clips, for those who are interested. Beautiful song, they do a great job, and for those who are into odd bits, or useless miscellaneous, it's tremendously popular in China and Japan. I think the BF are still touring and have just been out to Asia, which may explain it.