The temperature on May 16, 1911 was between 6.7 °C and 20.5 °C and averaged 15.0 °C. There was 7.8 hours of sunshine (50%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 26 » Glenn Curtiss flies the first successful American seaplane.
January 30 » The destroyer USSTerry makes the first airplane rescue at sea saving the life of Douglas McCurdy ten miles from Havana, Cuba.
March 25 » In New York City, the Triangle Shirtwaist Factory fire kills 146 garment workers.
May 21 » President of Mexico Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, concluding the initial phase of the Mexican Revolution.
May 23 » The New York Public Library is dedicated.
December 14 » Roald Amundsen's team, comprising himself, Olav Bjaaland, Helmer Hanssen, Sverre Hassel, and Oscar Wisting, becomes the first to reach the South Pole.
Day of death June 15, 1968
The temperature on June 15, 1968 was between 13.2 °C and 24.4 °C and averaged 19.0 °C. There was 11.3 hours of sunshine (68%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
January 23 » USS Pueblo (AGER-2) is attacked and seized by naval forces of North Korea.
January 24 » Vietnam War: The 1st Australian Task Force launches Operation Coburg against the North Vietnamese Army and Viet Cong during wider fighting around Long Bình and Biên Hòa.
April 11 » President Lyndon B. Johnson signs the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing.
June 5 » Presidential candidate Robert F. Kennedy is assassinated by Sirhan Sirhan.
July 1 » The Treaty on the Non-Proliferation of Nuclear Weapons is signed in Washington, D.C., London and Moscow by sixty-two countries.
December 10 » Japan's biggest heist, the still-unsolved "300 million yen robbery", is carried out in Tokyo.
When copying data from this family tree, please include a reference to the origin: Yvonne Luberti, "Family tree Trebert", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-trebert/I104.php : accessed January 8, 2026), "Derk Langenkamp (1911-1968)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.