I found this site and I thought that it may be of interest to others :)
It's a collection of old american cookbooks (from 1798 to 1922)
http://digital.lib.msu.edu/projects/cookbooks/index.html [1]
They are available to browse online or downloaded as pdf.
Links:
[1] http://digital.lib.msu.edu/projects/cookbooks/index.html