Walter Breen's "Complete Encyclopedia of US and Colonial Coins" has a section in the beginning of the book on weights, but it's a big book to leave next to the computer and it did not include most dollar varieties. I also check on Van Allen and Mallis' "Encyclopedia of Morgans and Peace dollars, but the quick search didn't reveal much. The reading is enjoyable, but I believe Nic is correct in saying Goggle-ing is probably the fastest way.























