What is the maximum speed recorded in cross country skiing or biathlon?

For a laboratory study professional skiers reached speeds of around 35km/h.

Stöggl, T., Müller, E., Ainegren, M., & Holmberg, H.-C. (2011). General strength and kinetics: fundamental to sprinting faster in cross country skiing? Scandinavian journal of medicine & science in sports, 21(6), 791-803. doi:10.1111/j.1600-0838.2009.01078.x