[tz] Error in zone America/Edmonton 1967, no DST, nor in 1969

[Paul Eggert]

Thanks for those bug reports. I also found two secondary sources, and installed 
the attached proposed patch.
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From 1ea14abada2942780bb79d15c95856cb8aec09ee Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Thu, 25 Jul 2019 01:08:32 -0700
Subject: [PROPOSED] Alberta did not observe DST in 1967 or 1969

(Thanks to Alois Triendl.)
* NEWS: Mention this.
* northamerica (Edm): No DST in 1967 or 1969.
---
 NEWS         |  4 ++--
 northamerica | 31 +++++++++++++++++++++----------
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/NEWS b/NEWS
index 58f064a..01bd070 100644
--- a/NEWS
+++ b/NEWS
@@ -12,8 +12,8 @@ Unreleased, experimental changes
     Fix several errors in pre-1970 transitions in Perry County, IN.
     (Thanks to Alois Triendl for pointing out the 1967/9 errors.)
 
-    In 1946 Vancouver ended DST on 09-29, not 10-13.  (Thanks to
-    Alois Triendl.)
+    Edmonton did not observe DST in 1967 or 1969.  In 1946 Vancouver
+    ended DST on 09-29, not 10-13.  (Thanks to Alois Triendl.)
 
   Changes to past time zone abbreviations and DST flags
 
diff --git a/northamerica b/northamerica
index 3d6f85f..270cc88 100644
--- a/northamerica
+++ b/northamerica
@@ -1233,6 +1233,12 @@ Zone America/Menominee	-5:50:27 -	LMT	1885 Sep 18 12:00
 #
 # Other sources occasionally used include:
 #
+#	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+#	<https://www.jstor.org/stable/1774359>.
+#
+#	Pearce C. The Great Daylight Saving Time Controversy.
+#	Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8.
+#
 #	Edward W. Whitman, World Time Differences,
 #	Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
 #	which I found in the UCLA library.
@@ -1241,9 +1247,6 @@ Zone America/Menominee	-5:50:27 -	LMT	1885 Sep 18 12:00
 #	<http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
 #	[PDF] (1914-03)
 #
-#	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
-#	<https://www.jstor.org/stable/1774359>.
-#
 # See the 'europe' file for Greenland.
 
 # Canada
@@ -1885,9 +1888,8 @@ Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
 # Willett (1914-03) notes that DST "has been in operation ... in the
 # City of Moose Jaw, Saskatchewan, for one year."
 
-# From Paul Eggert (2019-04-26):
-# Chris Pearce's book "The Great Daylight Saving Time Controversy" (2017)
-# says that Regina observed DST in 1914-1917.  No dates and times,
+# From Paul Eggert (2019-07-25):
+# Pearce's book says Regina observed DST in 1914-1917.  No dates and times,
 # unfortunately.  It also says that in 1914 Saskatoon observed DST
 # from 1 June to 6 July, and that DST was also tried out in Davidson,
 # Melfort, and Prince Albert.
@@ -1967,6 +1969,19 @@ Zone America/Swift_Current -7:11:20 -	LMT	1905 Sep
 
 # Alberta
 
+# From Alois Triendl (2019-07-19):
+# There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967.
+# 1969, no DST, from Edmonton Journal 18 April 1969
+#
+# From Paul Eggert (2019-07-25):
+# Pearce's book says that Alberta's 1948 Daylight Saving Act required
+# Mountain Standard Time without DST, and that "anyone who broke that law
+# could be fined up to $25 and costs".  There seems to be no record of
+# anybody paying the fine.  The law was not changed until an August 1971
+# plebiscite reinstituted DST in 1972.  This story is also mentioned in:
+# Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017.
+# ISBN 978-1459739123.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Edm	1918	1919	-	Apr	Sun>=8	2:00	1:00	D
 Rule	Edm	1918	only	-	Oct	27	2:00	0	S
@@ -1979,10 +1994,6 @@ Rule	Edm	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Edm	1945	only	-	Sep	lastSun	2:00	0	S
 Rule	Edm	1947	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1947	only	-	Sep	lastSun	2:00	0	S
-Rule	Edm	1967	only	-	Apr	lastSun	2:00	1:00	D
-Rule	Edm	1967	only	-	Oct	lastSun	2:00	0	S
-Rule	Edm	1969	only	-	Apr	lastSun	2:00	1:00	D
-Rule	Edm	1969	only	-	Oct	lastSun	2:00	0	S
 Rule	Edm	1972	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1972	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
-- 
2.17.1