You can post as many as you want however, do be reasonable about how many requests you want to make as we don't want to open up too many at once for users to stealth-fully take advantage of and upload files that may be under copyright everywhere (after 1924 for the USA), rather than being PD in the USA only, which is the point of this forum.
Go ahead and upload the work, it will only be open for about a day, then it will be locked if you fail to upload within that time.
EDIT: since I didn't get a reply, I went ahead and uploaded it, and am assuming a reviewer will move it to the right server.
OK, thank you. I apologize it has been a long time since I have contributed to the wiki; when I upload the scan, will it automatically go on the US Server, or is there a special link I should click? I am looking around for info on this, or a link, and I can't find anything. Since I am uploading a lot of stuff these days I want to make sure I get it right the first time (when I can)...
You have to upload it directly to the USA server. I already reuploaded it. If you go into the classic skin and use the old Add File page, there is a hidden link to the USA server page you can do the upload there up top.