February 1 » Fountains Valley, Pretoria, the oldest nature reserve in Africa, is proclaimed by President Paul Kruger.
May 25 » The Republic of Formosa is formed, with Tang Jingsong as its president.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
September 18 » The Atlanta Exposition Speech on race relations is delivered by Booker T. Washington.
November 28 » The first American automobile race takes place over the 54 miles from Chicago's Jackson Park to Evanston, Illinois. Frank Duryea wins in approximately 10 hours.
December 28 » Wilhelm Röntgen publishes a paper detailing his discovery of a new type of radiation, which later will be known as x-rays.
Day of marriage June 30, 1917
The temperature on June 30, 1917 was between 13.6 °C and 17.2 °C and averaged 15.0 °C. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I130659.php : accessed December 30, 2025), "Maatje Leerstra (1895-????)".
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