Added changes to U.S. time zone boundaries from 1930 to 1940

Added changes to U.S. time zone boundaries from 1930 to 1940

Fixed typo in start_event

Fixed gap in Virginia boundary relations

Fixed gap in Virginia boundary relation

Fixed duplicate membership in Maine boundary relation

Added changes to U.S. time zone boundaries from 1950 to 1967

Reverted changeset 111848: vandalism

Wayne Co., Indiana Territory ≠ Wayne Co., IN

Wayne Co., NW Terr. ≠ Wayne Co., IN ≠ Wayne, IN

Added Pacific Time Zone prior to addition of peninsular Alaska

Removed invalid role from chronology relation

Added changes to U.S. time zone boundaries from 1967 to 1970

Choteau Co., SD ≠ Perkins Co., SD

Greasewood Co., UT ≠ Box Elder Co., UT

Wabash New Purchase Co., IN ≠ Wabash Co., IN; expanded abbreviations in county names

Wallace Co., ND ≠ Wallace Co., KS

Corrected geometry of Mountain Time Zone prior to western Jones Co., SD, being moved from Mountain to Central Time Zone; City of Murdo has been in Central the whole time

Corrected geometry of Mountain Time Zone prior to Mercer Co., ND, being moved from Mountain to Central Time Zone

USDOT time zone dataset incorrectly follows a line over 13 miles to the east of the range line that forms the eastern boundary of Menominee, Michigan