This was the situation by the time World War II interrupted further research, with some even believing it did not exist at all.
Niagara Falls | frog | Great Falls, Montana | Wichita Falls, Texas | Kermit the Frog | Klamath Falls, Oregon | Great Falls | Idaho Falls, Idaho | Wichita Falls | Sioux Falls, South Dakota | Red Lake Falls, Minnesota | Red Lake Falls | Falls Church, Virginia | Bellows Falls, Vermont | Niagara Falls, Ontario | Menomonee Falls, Wisconsin | Niagara Falls, New York | Jones Falls | Victoria Falls | Seneca Falls, New York | Menomonee Falls | Reichenbach Falls | Redwood Falls, Minnesota | Idaho Falls | Cedar Falls, Iowa | Before Night Falls | Twin Falls, Idaho | Thief River Falls, Minnesota | Smiths Falls | Michigan J. Frog |