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Canada doesn't seem to be listed in the country drop down list.

So, am I correct in assuming you're downloading all the data off the Seemless server manually? (no batching?).

Anyone looked at batching it?
Anyone know if it violates their license agreement? (I couldn't see anything, but if someone has tried and been banned, I don't want to try).
Anyone have more details of the format of the URLs?
I know that this:
http://extract.cr.usgs.gov/Website/distreq/RequestSummary.jsp?AL=30.5,30,-88,-89&PL=ND301HZ,

Retrieves a listing of all the data within that bounding box, generally split in to a number of individual files

If you add &CS=250 to the URL you can get them as one file. Modifying the PL= value changes the format or the product you're looking to download.

You can go direct to the download page with
http://extract.cr.usgs.gov/diststatus/servlet/gov.usgs.edc.RequestStatus?siz=58&key=ND3&ras=1&rsp=1&pfm=GridFloat&imsurl=-1&ms=-1&att=-1&lay=-1&fid=-1&dlpre=&lft=-86.0&rgt=-85.75&top=33.5&bot=33.0&wmd=1&mur=http%3A%2F%2Fextract.cr.usgs.gov%2Fdistmeta%2Fservlet%2Fgov.usgs.edc.MetaBuilder&mcd=NED13&mdf=HTML&arc=ZIP&sde=NED.conus_ned_13e&msd=NED.CONUS_NED_13_METADATA&zun=METERS&prj=0&csx=9.259259260000041E-5&csy=9.259259260000041E-5&bnd=&bndnm=&RC=49bd874d86e654d1446be822b3a27a1ad16187ee

Where lft, rgt, top, bot refer to the left, right, top and bottom.
arc is obviously the ARChive format.
siz= is the "Size" in megabytes of the file
mdf = metadata format
key =???
RC = Some kind of UID? Can be left blank, but must be submitted
zun = Z Units (must be meters?)
csx= X grid spacing
csy = Y grid spacing
bnd = ?
bndnum = ?

All fields seem to be required, but have some flexibility as far as the input data (don't know if this changes the output data)