This research was supported by the AIRMAP program under NOAA Contract NA03OAR4600122. We thank Stephen Hudson for helpful discussions and technical assistance, Peter Crane for assistance with historical photographs, and the team of volunteers who helped with data entry: Will Abbott, Daniel Block, Jon Cotton, Jeff DeRosa, Ryan Harvey, Ken Jones, Al and Marion Lake, Neil Lareau, Ron Lavoie, Tim Markle, Ceal Peacock, Chris Perruzzi, Marsha Rich, Dan Solari, Mark Van Baalen, Andy Wall, and Liz Willey. We thank Martin Weinhelt and the Generic Mapping Tools project for help in creating the map in Fig. 1, and the reviewers for insightful comments that resulted in an improved manuscript.
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