The university where I volunteer has not collected these, yet, but
eventually they will be collected and a searchable database will be
provided. For now, you can see a partial listing of these sites at:
This research is copyrighted, and I volunteer as a University of ARizona,
Maricopa County Master Gardener.
Hope this helps.
There is no human problem which could not be solved if people
would simply do as I advise.