Does anyone have any experience with obtaining WW1 alien registrations from Alameda county? I would love to get a copy of my ggrandfather's sisters' registration. I don't have her 1920 census, but the 1930 lists her status as "al" so I presume she would have registered. Where/how do I order the record, how much does it cost and what information do I need to provide? Is there an online index? Any help greatly appreciated. Betty