Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Great Western Stages - existed in 1930's.
Grey Goose - existed in 1930's.
La Crosse & Western Stages - served La Crosse WI, Caledonia, Spring Grove, Mabel, Canton, La Crescent.
Northern Lakes Bus Co. - served Breckinridge to Fergus Falls.
Sioux Limited Lines - existed in 1930's.