Erfgoed Leiden eo: Huwelijksakten 1935, archiefnummer 1005, Archief van de ambtenaar van de Burgerlijke Stand van Leiden, 1929-1993, inventarisnummer 65, aktenummer 405 Gemeente Leiden
The temperature on February 10, 1911 was between -6.1 °C and 2.9 °C and averaged -2.2 °C. There was 8.0 hours of sunshine (83%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southeast. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
May 19 » Parks Canada, the world's first national park service, is established as the Dominion Parks Branch under the Department of the Interior.
July 4 » A massive heat wave strikes the northeastern United States, killing 380 people in eleven days and breaking temperature records in several cities.
November 17 » Omega Psi Phi fraternity was founded on the campus of Howard University in Washington, D.C.
December 24 » Lackawanna Cut-Off railway line opens in New Jersey and Pennsylvania.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
When copying data from this family tree, please include a reference to the origin: R.A.Hemerik, "Descendants Hemerik-Broekhuizen-Huner-Koper-Barink", database, Genealogy Online (https://www.genealogieonline.nl/parenteel-hemerik/I181029.php : accessed February 16, 2026), "Hendrika Johanna Zeventer (1911-)".
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