Apple Duathlon
Sports, Multi-Sports, Duathlon, Events - Apple Duathlon. It is a 10k-42k-5k event.
http://www.appleduathlon.com/
Just Racing UK
Sports, Multi-Sports, Triathlon - Just Racing. Organisers of Triathlon and Multi Sport events in the UK.
https://www.justracinguk.com/
Colorado Biathlon Club
Sports, Multi-Sports, Biathlon - Colorado Biathlon Club. Provides news, events, race results, training tips, classified ads, and newsletters for biathlon athletes of Colorado.
https://www.coloradobiathlon.org/
International Biathlon Union
Sports, Multi-Sports, Biathlon - International Biathlon Union. The major organization representing the biathlon worldwide, the site includes history, news, events, and a results section.
https://www.biathlonworld.com/