Winter holidays, Parisians crowd into trains going to the Alps.
Ski of tourist base, winter resorts in the Alps, youth hostels
CSHA, ski vacation in Sun Valley (Sun Valley)
CSHA, the fight against insects - pests of forests and agriculture.
Felling of infected trees.
Pollination fields from an airplane
Key words
France, hiking, mountain resorts;
USA, tourism, mountains, Leisure
USA, agriculture, insects, Aviation