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diff --git a/elsie.nci.nih.gov/src/Theory b/elsie.nci.nih.gov/src/Theory
index 96cba51..4f9c226 100644
--- a/elsie.nci.nih.gov/src/Theory
+++ b/elsie.nci.nih.gov/src/Theory
@@ -263,7 +263,15 @@ Errors in the tz database arise from many sources:
be needed if the tz database's scope were extended to cover even
just the known or guessed history of standard time; for example,
the current single entry for France would need to split into dozens
- of entries, perhaps hundreds.
+ of entries, perhaps hundreds. And in most of the world even this
+ approach would be misleading due to widespread disagreement or
+ indifference about what times should be observed. In her 2015 book
+ "The Global Transformation of Time, 1870-1950", Vanessa Ogle writes
+ "Outside of Europe and North America there was no system of time
+ zones at all, often not even a stable landscape of mean times,
+ prior to the middle decades of the twentieth century". See:
+ Timothy Shenk, Booked: A Global History of Time. Dissent 2015-12-17
+ https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanessa-ogle
* Most of the pre-1970 data entries come from unreliable sources, often
astrology books that lack citations and whose compilers evidently